1011801312 has 72 divisors (see below), whose sum is σ = 2970152640. Its totient is φ = 326384640.

The previous prime is 1011801283. The next prime is 1011801317. The reversal of 1011801312 is 2131081101.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011801317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47737 + ... + 65592.

It is an arithmetic number, because the mean of its divisors is an integer number (41252120).

Almost surely, 2^1011801312 is an apocalyptic number.

1011801312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1011801312 is an abundant number, since it is smaller than the sum of its proper divisors (1958351328).

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

1011801312 is a wasteful number, since it uses less digits than its factorization.

1011801312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113376 (or 113365 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 1011801312 is about 31808.8244359957. The cubic root of 1011801312 is about 1003.9183967792.

Adding to 1011801312 its reverse (2131081101), we get a palindrome (3142882413).

The spelling of 1011801312 in words is "one billion, eleven million, eight hundred one thousand, three hundred twelve".