251172942 has 8 divisors (see below), whose sum is σ = 502345896. Its totient is φ = 83724312.

The previous prime is 251172941. The next prime is 251172953. The reversal of 251172942 is 249271152.

It is a sphenic number, since it is the product of 3 distinct primes.

251172942 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251172941) 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, 20931073 + ... + 20931084.

It is an arithmetic number, because the mean of its divisors is an integer number (62793237).

Almost surely, 2^251172942 is an apocalyptic number.

251172942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251172942 is a wasteful number, since it uses less digits than its factorization.

251172942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41862162.

The product of its digits is 10080, while the sum is 33.

The square root of 251172942 is about 15848.4365790446. The cubic root of 251172942 is about 630.9441977036.

The spelling of 251172942 in words is "two hundred fifty-one million, one hundred seventy-two thousand, nine hundred forty-two".