51958161 has 6 divisors (see below), whose sum is σ = 75050690. Its totient is φ = 34638768.

The previous prime is 51958129. The next prime is 51958189. The reversal of 51958161 is 16185915.

51958161 is a `hidden beast` number, since 5 + 19 + 581 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 31708161 + 20250000 = 5631^2 + 4500^2 .

It is not a de Polignac number, because 51958161 - 2⁵ = 51958129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51958121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2886556 + ... + 2886573.

Almost surely, 2^51958161 is an apocalyptic number.

It is an amenable number.

51958161 is a deficient number, since it is larger than the sum of its proper divisors (23092529).

51958161 is a wasteful number, since it uses less digits than its factorization.

51958161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773135 (or 5773132 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 51958161 is about 7208.2009544685. The cubic root of 51958161 is about 373.1509833509.

The spelling of 51958161 in words is "fifty-one million, nine hundred fifty-eight thousand, one hundred sixty-one".