251139982 has 8 divisors (see below), whose sum is σ = 378327456. Its totient is φ = 125030832.

The previous prime is 251139943. The next prime is 251139983. The reversal of 251139982 is 289931152.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251139983) 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, 268998 + ... + 269929.

It is an arithmetic number, because the mean of its divisors is an integer number (47290932).

Almost surely, 2^251139982 is an apocalyptic number.

251139982 is a deficient number, since it is larger than the sum of its proper divisors (127187474).

251139982 is a wasteful number, since it uses less digits than its factorization.

251139982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539162.

The product of its digits is 38880, while the sum is 40.

The square root of 251139982 is about 15847.3966947256. The cubic root of 251139982 is about 630.9165980873.

The spelling of 251139982 in words is "two hundred fifty-one million, one hundred thirty-nine thousand, nine hundred eighty-two".