1251622525 has 24 divisors (see below), whose sum is σ = 1583551424. Its totient is φ = 981158400.

The previous prime is 1251622481. The next prime is 1251622529. The reversal of 1251622525 is 5252261521.

It is a happy number.

It is not a de Polignac number, because 1251622525 - 2¹⁹ = 1251098237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251622529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 247270 + ... + 252280.

Almost surely, 2^1251622525 is an apocalyptic number.

It is an amenable number.

1251622525 is a deficient number, since it is larger than the sum of its proper divisors (331928899).

1251622525 is a wasteful number, since it uses less digits than its factorization.

1251622525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221 (or 5216 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 1251622525 is about 35378.2775866774. The cubic root of 1251622525 is about 1077.6832267189.

The spelling of 1251622525 in words is "one billion, two hundred fifty-one million, six hundred twenty-two thousand, five hundred twenty-five".