251401161 has 8 divisors (see below), whose sum is σ = 365674464. Its totient is φ = 152364320.

The previous prime is 251401159. The next prime is 251401181. The reversal of 251401161 is 161104152.

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 251401161 - 2¹ = 251401159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251401121) 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, 3809076 + ... + 3809141.

It is an arithmetic number, because the mean of its divisors is an integer number (45709308).

Almost surely, 2^251401161 is an apocalyptic number.

It is an amenable number.

251401161 is a deficient number, since it is larger than the sum of its proper divisors (114273303).

251401161 is a wasteful number, since it uses less digits than its factorization.

251401161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7618231.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 251401161 is about 15855.6349920147. The cubic root of 251401161 is about 631.1352345555.

The spelling of 251401161 in words is "two hundred fifty-one million, four hundred one thousand, one hundred sixty-one".