251142967 has 4 divisors (see below), whose sum is σ = 252185296. Its totient is φ = 250100640.

The previous prime is 251142953. The next prime is 251142971. The reversal of 251142967 is 769241152.

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

It is a cyclic number.

It is not a de Polignac number, because 251142967 - 2¹⁹ = 250618679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251142167) 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, 520803 + ... + 521284.

It is an arithmetic number, because the mean of its divisors is an integer number (63046324).

Almost surely, 2^251142967 is an apocalyptic number.

251142967 is a deficient number, since it is larger than the sum of its proper divisors (1042329).

251142967 is a wasteful number, since it uses less digits than its factorization.

251142967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042328.

The product of its digits is 30240, while the sum is 37.

The square root of 251142967 is about 15847.4908739523. The cubic root of 251142967 is about 630.9190977272.

The spelling of 251142967 in words is "two hundred fifty-one million, one hundred forty-two thousand, nine hundred sixty-seven".