1251262525 has 12 divisors (see below), whose sum is σ = 1561453012. Its totient is φ = 994631040.

The previous prime is 1251262513. The next prime is 1251262553. The reversal of 1251262525 is 5252621521.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 162460516 + 1088802009 = 12746^2 + 32997^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1251262525 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155472 + ... + 163321.

Almost surely, 2^1251262525 is an apocalyptic number.

It is an amenable number.

1251262525 is a deficient number, since it is larger than the sum of its proper divisors (310190487).

1251262525 is a wasteful number, since it uses less digits than its factorization.

1251262525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318960 (or 318955 counting only the distinct ones).

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

The square root of 1251262525 is about 35373.1893529549. The cubic root of 1251262525 is about 1077.5798933372.

The spelling of 1251262525 in words is "one billion, two hundred fifty-one million, two hundred sixty-two thousand, five hundred twenty-five".