251240997 has 8 divisors (see below), whose sum is σ = 382843456. Its totient is φ = 143566272.

The previous prime is 251240987. The next prime is 251241013. The reversal of 251240997 is 799042152.

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

It is not a de Polignac number, because 251240997 - 2⁴ = 251240981 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 (251240947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5981908 + ... + 5981949.

It is an arithmetic number, because the mean of its divisors is an integer number (47855432).

Almost surely, 2^251240997 is an apocalyptic number.

It is an amenable number.

251240997 is a deficient number, since it is larger than the sum of its proper divisors (131602459).

251240997 is a wasteful number, since it uses less digits than its factorization.

251240997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11963867.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 251240997 is about 15850.5834908372. The cubic root of 251240997 is about 631.0011770761.

The spelling of 251240997 in words is "two hundred fifty-one million, two hundred forty thousand, nine hundred ninety-seven".