251223453131 has 16 divisors (see below), whose sum is σ = 289137193920. Its totient is φ = 213817743360.

The previous prime is 251223453079. The next prime is 251223453149. The reversal of 251223453131 is 131354322152.

It is a cyclic number.

It is not a de Polignac number, because 251223453131 - 2¹⁴ = 251223436747 is a prime.

It is a super-2 number, since 2×251223453131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251223453161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1559651 + ... + 1713171.

It is an arithmetic number, because the mean of its divisors is an integer number (18071074620).

Almost surely, 2^251223453131 is an apocalyptic number.

251223453131 is a deficient number, since it is larger than the sum of its proper divisors (37913740789).

251223453131 is a wasteful number, since it uses less digits than its factorization.

251223453131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155174.

The product of its digits is 21600, while the sum is 32.

Adding to 251223453131 its reverse (131354322152), we get a palindrome (382577775283).

The spelling of 251223453131 in words is "two hundred fifty-one billion, two hundred twenty-three million, four hundred fifty-three thousand, one hundred thirty-one".