1011251440 has 80 divisors (see below), whose sum is σ = 2541935520. Its totient is φ = 372833280.

The previous prime is 1011251411. The next prime is 1011251441. The reversal of 1011251440 is 441521101.

1011251440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011251441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47250 + ... + 65230.

It is an arithmetic number, because the mean of its divisors is an integer number (31774194).

Almost surely, 2^1011251440 is an apocalyptic number.

1011251440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011251440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1270967760).

1011251440 is an abundant number, since it is smaller than the sum of its proper divisors (1530684080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011251440 is a wasteful number, since it uses less digits than its factorization.

1011251440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18050 (or 18044 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1011251440 is about 31800.1798737051. The cubic root of 1011251440 is about 1003.7365011700.

Adding to 1011251440 its reverse (441521101), we get a palindrome (1452772541).

The spelling of 1011251440 in words is "one billion, eleven million, two hundred fifty-one thousand, four hundred forty".