251350005131 has 4 divisors (see below), whose sum is σ = 256092458112. Its totient is φ = 246607552152.

The previous prime is 251350005121. The next prime is 251350005133. The reversal of 251350005131 is 131500053152.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251350005131 is a prime.

It is a super-2 number, since 2×251350005131² (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 251350005131.

It is not an unprimeable number, because it can be changed into a prime (251350005133) 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, 2371226411 + ... + 2371226516.

It is an arithmetic number, because the mean of its divisors is an integer number (64023114528).

Almost surely, 2^251350005131 is an apocalyptic number.

251350005131 is a deficient number, since it is larger than the sum of its proper divisors (4742452981).

251350005131 is an equidigital number, since it uses as much as digits as its factorization.

251350005131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742452980.

The product of its (nonzero) digits is 2250, while the sum is 26.

Adding to 251350005131 its reverse (131500053152), we get a palindrome (382850058283).

The spelling of 251350005131 in words is "two hundred fifty-one billion, three hundred fifty million, five thousand, one hundred thirty-one".