251070161 has 16 divisors (see below), whose sum is σ = 281669760. Its totient is φ = 222393600.

The previous prime is 251070121. The next prime is 251070167. The reversal of 251070161 is 161070152.

It is a cyclic number.

It is not a de Polignac number, because 251070161 - 2⁶ = 251070097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251070167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48236 + ... + 53186.

It is an arithmetic number, because the mean of its divisors is an integer number (17604360).

Almost surely, 2^251070161 is an apocalyptic number.

It is an amenable number.

251070161 is a deficient number, since it is larger than the sum of its proper divisors (30599599).

251070161 is a wasteful number, since it uses less digits than its factorization.

251070161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 251070161 is about 15845.1936245664. The cubic root of 251070161 is about 630.8581243092.

Subtracting from 251070161 its reverse (161070152), we obtain a palindrome (90000009).

The spelling of 251070161 in words is "two hundred fifty-one million, seventy thousand, one hundred sixty-one".