251442155 has 16 divisors (see below), whose sum is σ = 320169024. Its totient is φ = 188912640.

The previous prime is 251442097. The next prime is 251442203. The reversal of 251442155 is 551244152.

It is not a de Polignac number, because 251442155 - 2⁶ = 251442091 is a prime.

It is a super-2 number, since 2×251442155² = 126446314622088050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39815 + ... + 45695.

It is an arithmetic number, because the mean of its divisors is an integer number (20010564).

Almost surely, 2^251442155 is an apocalyptic number.

251442155 is a deficient number, since it is larger than the sum of its proper divisors (68726869).

251442155 is a wasteful number, since it uses less digits than its factorization.

251442155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6406.

The product of its digits is 8000, while the sum is 29.

The square root of 251442155 is about 15856.9276658500. The cubic root of 251442155 is about 631.1695374356.

The spelling of 251442155 in words is "two hundred fifty-one million, four hundred forty-two thousand, one hundred fifty-five".