51615161 has 16 divisors (see below), whose sum is σ = 56901264. Its totient is φ = 46531584.

The previous prime is 51615149. The next prime is 51615241. The reversal of 51615161 is 16151615.

It can be written as a sum of positive squares in 8 ways, for example, as 48400 + 51566761 = 220^2 + 7181^2 .

It is a cyclic number.

It is not a de Polignac number, because 51615161 - 2¹⁰ = 51614137 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 51615161.

It is not an unprimeable number, because it can be changed into a prime (51615101) 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, 129815 + ... + 130211.

It is an arithmetic number, because the mean of its divisors is an integer number (3556329).

Almost surely, 2^51615161 is an apocalyptic number.

It is an amenable number.

51615161 is a deficient number, since it is larger than the sum of its proper divisors (5286103).

51615161 is a wasteful number, since it uses less digits than its factorization.

51615161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620.

The product of its digits is 900, while the sum is 26.

The square root of 51615161 is about 7184.3692137863. The cubic root of 51615161 is about 372.3280554119.

Adding to 51615161 its reverse (16151615), we get a palindrome (67766776).

The spelling of 51615161 in words is "fifty-one million, six hundred fifteen thousand, one hundred sixty-one".