251078013 has 24 divisors (see below), whose sum is σ = 375612120. Its totient is φ = 161516160.

The previous prime is 251077999. The next prime is 251078029. The reversal of 251078013 is 310870152.

It can be written as a sum of positive squares in 4 ways, for example, as 29127609 + 221950404 = 5397^2 + 14898^2 .

It is not a de Polignac number, because 251078013 - 2¹² = 251073917 is a prime.

It is a super-2 number, since 2×251078013² = 126080337224056338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251078033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24783 + ... + 33411.

It is an arithmetic number, because the mean of its divisors is an integer number (15650505).

Almost surely, 2^251078013 is an apocalyptic number.

It is an amenable number.

251078013 is a deficient number, since it is larger than the sum of its proper divisors (124534107).

251078013 is a wasteful number, since it uses less digits than its factorization.

251078013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8749 (or 8746 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 251078013 is about 15845.4413949249. The cubic root of 251078013 is about 630.8647007529.

The spelling of 251078013 in words is "two hundred fifty-one million, seventy-eight thousand, thirteen".