1251164025 has 18 divisors (see below), whose sum is σ = 2240974190. Its totient is φ = 667287360.

The previous prime is 1251163981. The next prime is 1251164029. The reversal of 1251164025 is 5204611521.

1251164025 is a `hidden beast` number, since 1 + 2 + 5 + 11 + 640 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 123010281 + 1128153744 = 11091^2 + 33588^2 .

It is not a de Polignac number, because 1251164025 - 2⁶ = 1251163961 is a prime.

It is a super-2 number, since 2×1251164025² = 3130822834908401250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1251164025.

It is not an unprimeable number, because it can be changed into a prime (1251164029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2780140 + ... + 2780589.

Almost surely, 2^1251164025 is an apocalyptic number.

1251164025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251164025 is a deficient number, since it is larger than the sum of its proper divisors (989810165).

1251164025 is a wasteful number, since it uses less digits than its factorization.

1251164025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560745 (or 5560737 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1251164025 is about 35371.7970281409. The cubic root of 1251164025 is about 1077.5516167226.

Adding to 1251164025 its reverse (5204611521), we get a palindrome (6455775546).

The spelling of 1251164025 in words is "one billion, two hundred fifty-one million, one hundred sixty-four thousand, twenty-five".