251390117 has 8 divisors (see below), whose sum is σ = 274708800. Its totient is φ = 228148960.

The previous prime is 251390107. The next prime is 251390119. The reversal of 251390117 is 711093152.

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

It is a cyclic number.

It is not a de Polignac number, because 251390117 - 2⁶ = 251390053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251390117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251390119) 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, 12488 + ... + 25665.

It is an arithmetic number, because the mean of its divisors is an integer number (34338600).

Almost surely, 2^251390117 is an apocalyptic number.

It is an amenable number.

251390117 is a deficient number, since it is larger than the sum of its proper divisors (23318683).

251390117 is a wasteful number, since it uses less digits than its factorization.

251390117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38763.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 251390117 is about 15855.2867208386. The cubic root of 251390117 is about 631.1259925409.

The spelling of 251390117 in words is "two hundred fifty-one million, three hundred ninety thousand, one hundred seventeen".