1251455125513 has 4 divisors (see below), whose sum is σ = 1254003914448. Its totient is φ = 1248906336580.

The previous prime is 1251455125451. The next prime is 1251455125517. The reversal of 1251455125513 is 3155215541521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1251455125513 - 2³⁷ = 1114016172041 is a prime.

It is a super-2 number, since 2×1251455125513² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251455125517) 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, 1274393731 + ... + 1274394712.

It is an arithmetic number, because the mean of its divisors is an integer number (313500978612).

Almost surely, 2^{1251455125513} is an apocalyptic number.

It is an amenable number.

1251455125513 is a deficient number, since it is larger than the sum of its proper divisors (2548788935).

1251455125513 is an equidigital number, since it uses as much as digits as its factorization.

1251455125513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548788934.

The product of its digits is 150000, while the sum is 40.

The spelling of 1251455125513 in words is "one trillion, two hundred fifty-one billion, four hundred fifty-five million, one hundred twenty-five thousand, five hundred thirteen".