1251251251525 has 24 divisors (see below), whose sum is σ = 1707580511424. Its totient is φ = 901947782400.

The previous prime is 1251251251517. The next prime is 1251251251531. The reversal of 1251251251525 is 5251521521521.

It is not a de Polignac number, because 1251251251525 - 2³ = 1251251251517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20101689 + ... + 20163838.

It is an arithmetic number, because the mean of its divisors is an integer number (71149187976).

Almost surely, 2^{1251251251525} is an apocalyptic number.

It is an amenable number.

1251251251525 is a deficient number, since it is larger than the sum of its proper divisors (456329259899).

1251251251525 is a wasteful number, since it uses less digits than its factorization.

1251251251525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40265661 (or 40265656 counting only the distinct ones).

The product of its digits is 50000, while the sum is 37.

The spelling of 1251251251525 in words is "one trillion, two hundred fifty-one billion, two hundred fifty-one million, two hundred fifty-one thousand, five hundred twenty-five".