251213547013 has 32 divisors (see below), whose sum is σ = 310842427392. Its totient is φ = 199758187200.

The previous prime is 251213546999. The next prime is 251213547019. The reversal of 251213547013 is 310745312152.

It is a de Polignac number, because none of the positive numbers 2^k-251213547013 is a prime.

It is a super-2 number, since 2×251213547013² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251213547013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251213547019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4993 + ... + 708838.

It is an arithmetic number, because the mean of its divisors is an integer number (9713825856).

Almost surely, 2^251213547013 is an apocalyptic number.

251213547013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

251213547013 is a deficient number, since it is larger than the sum of its proper divisors (59628880379).

251213547013 is a wasteful number, since it uses less digits than its factorization.

251213547013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713985.

The product of its (nonzero) digits is 25200, while the sum is 34.

Adding to 251213547013 its reverse (310745312152), we get a palindrome (561958859165).

The spelling of 251213547013 in words is "two hundred fifty-one billion, two hundred thirteen million, five hundred forty-seven thousand, thirteen".