251161361 has 8 divisors (see below), whose sum is σ = 288415200. Its totient is φ = 216311040.

The previous prime is 251161343. The next prime is 251161381. The reversal of 251161361 is 163161152.

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

It is not a de Polignac number, because 251161361 - 2¹⁰ = 251160337 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 251161361.

It is not an unprimeable number, because it can be changed into a prime (251161381) 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, 600656 + ... + 601073.

It is an arithmetic number, because the mean of its divisors is an integer number (36051900).

Almost surely, 2^251161361 is an apocalyptic number.

It is an amenable number.

251161361 is a deficient number, since it is larger than the sum of its proper divisors (37253839).

251161361 is a wasteful number, since it uses less digits than its factorization.

251161361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201759.

The product of its digits is 1080, while the sum is 26.

The square root of 251161361 is about 15848.0712075634. The cubic root of 251161361 is about 630.9345004315.

The spelling of 251161361 in words is "two hundred fifty-one million, one hundred sixty-one thousand, three hundred sixty-one".