251612073 has 6 divisors (see below), whose sum is σ = 363439674. Its totient is φ = 167741376.

The previous prime is 251612059. The next prime is 251612159. The reversal of 251612073 is 370216152.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 201867264 + 49744809 = 14208^2 + 7053^2 .

It is not a de Polignac number, because 251612073 - 2⁴ = 251612057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251612773) 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 5 ways as a sum of consecutive naturals, for example, 13978440 + ... + 13978457.

It is an arithmetic number, because the mean of its divisors is an integer number (60573279).

Almost surely, 2^251612073 is an apocalyptic number.

It is an amenable number.

251612073 is a deficient number, since it is larger than the sum of its proper divisors (111827601).

251612073 is a wasteful number, since it uses less digits than its factorization.

251612073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27956903 (or 27956900 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 251612073 is about 15862.2846084667. The cubic root of 251612073 is about 631.3116813498.

The spelling of 251612073 in words is "two hundred fifty-one million, six hundred twelve thousand, seventy-three".