251513201023 has 8 divisors (see below), whose sum is σ = 287449687040. Its totient is φ = 215578222200.

The previous prime is 251513201003. The next prime is 251513201039. The reversal of 251513201023 is 320102315152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251513201023 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 (251513201003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6838 + ... + 709276.

It is an arithmetic number, because the mean of its divisors is an integer number (35931210880).

Almost surely, 2^251513201023 is an apocalyptic number.

251513201023 is a deficient number, since it is larger than the sum of its proper divisors (35936486017).

251513201023 is an equidigital number, since it uses as much as digits as its factorization.

251513201023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753597.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 251513201023 its reverse (320102315152), we get a palindrome (571615516175).

The spelling of 251513201023 in words is "two hundred fifty-one billion, five hundred thirteen million, two hundred one thousand, twenty-three".