1551211040 has 24 divisors (see below), whose sum is σ = 3664736460. Its totient is φ = 620484352.

The previous prime is 1551211027. The next prime is 1551211043. The reversal of 1551211040 is 401121551.

It can be written as a sum of positive squares in 2 ways, for example, as 1521312016 + 29899024 = 39004^2 + 5468^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1551211043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4847375 + ... + 4847694.

Almost surely, 2^1551211040 is an apocalyptic number.

1551211040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551211040 is an abundant number, since it is smaller than the sum of its proper divisors (2113525420).

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

1551211040 is an equidigital number, since it uses as much as digits as its factorization.

1551211040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695084 (or 9695076 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1551211040 is about 39385.4165904082. The cubic root of 1551211040 is about 1157.5958530930.

Adding to 1551211040 its reverse (401121551), we get a palindrome (1952332591).

The spelling of 1551211040 in words is "one billion, five hundred fifty-one million, two hundred eleven thousand, forty".