251113399 has 4 divisors (see below), whose sum is σ = 252654136. Its totient is φ = 249572664.

The previous prime is 251113351. The next prime is 251113403. The reversal of 251113399 is 993311152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 251113399 - 2²⁵ = 217558967 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 (251113319) 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, 770124 + ... + 770449.

It is an arithmetic number, because the mean of its divisors is an integer number (63163534).

Almost surely, 2^251113399 is an apocalyptic number.

251113399 is a deficient number, since it is larger than the sum of its proper divisors (1540737).

251113399 is a wasteful number, since it uses less digits than its factorization.

251113399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540736.

The product of its digits is 7290, while the sum is 34.

The square root of 251113399 is about 15846.5579543319. The cubic root of 251113399 is about 630.8943366011.

The spelling of 251113399 in words is "two hundred fifty-one million, one hundred thirteen thousand, three hundred ninety-nine".