1251113320 has 16 divisors (see below), whose sum is σ = 2815005060. Its totient is φ = 500445312.

The previous prime is 1251113299. The next prime is 1251113323. The reversal of 1251113320 is 233111521.

It can be written as a sum of positive squares in 2 ways, for example, as 1249056964 + 2056356 = 35342^2 + 1434^2 .

It is not an unprimeable number, because it can be changed into a prime (1251113323) 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, 15638877 + ... + 15638956.

Almost surely, 2^1251113320 is an apocalyptic number.

1251113320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251113320 is an abundant number, since it is smaller than the sum of its proper divisors (1563891740).

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

1251113320 is a wasteful number, since it uses less digits than its factorization.

1251113320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31277844 (or 31277840 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1251113320 is about 35371.0802775375. The cubic root of 1251113320 is about 1077.5370601465.

Adding to 1251113320 its reverse (233111521), we get a palindrome (1484224841).

The spelling of 1251113320 in words is "one billion, two hundred fifty-one million, one hundred thirteen thousand, three hundred twenty".