251433161 has 24 divisors (see below), whose sum is σ = 307800000. Its totient is φ = 204487584.

The previous prime is 251433151. The next prime is 251433173. The reversal of 251433161 is 161334152.

It is not a de Polignac number, because 251433161 - 2²⁶ = 184324297 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 251433161.

It is not an unprimeable number, because it can be changed into a prime (251433151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82340 + ... + 85338.

It is an arithmetic number, because the mean of its divisors is an integer number (12825000).

Almost surely, 2^251433161 is an apocalyptic number.

It is an amenable number.

251433161 is a deficient number, since it is larger than the sum of its proper divisors (56366839).

251433161 is a wasteful number, since it uses less digits than its factorization.

251433161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3101 (or 3094 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 251433161 is about 15856.6440648707. The cubic root of 251433161 is about 631.1620117730.

Subtracting from 251433161 its reverse (161334152), we obtain a palindrome (90099009).

The spelling of 251433161 in words is "two hundred fifty-one million, four hundred thirty-three thousand, one hundred sixty-one".