51161553 has 6 divisors (see below), whose sum is σ = 73900034. Its totient is φ = 34107696.

The previous prime is 51161543. The next prime is 51161557. The reversal of 51161553 is 35516115.

51161553 is a `hidden beast` number, since 51 + 1 + 61 + 553 = 666.

It can be written as a sum of positive squares in only one way, i.e., 33039504 + 18122049 = 5748^2 + 4257^2 .

It is not a de Polignac number, because 51161553 - 2⁶ = 51161489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51161557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2842300 + ... + 2842317.

Almost surely, 2^51161553 is an apocalyptic number.

It is an amenable number.

51161553 is a deficient number, since it is larger than the sum of its proper divisors (22738481).

51161553 is a wasteful number, since it uses less digits than its factorization.

51161553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5684623 (or 5684620 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 51161553 is about 7152.7304576644. The cubic root of 51161553 is about 371.2341380156.

Adding to 51161553 its reverse (35516115), we get a palindrome (86677668).

It can be divided in two parts, 51 and 161553, that added together give a square (161604 = 402²).

The spelling of 51161553 in words is "fifty-one million, one hundred sixty-one thousand, five hundred fifty-three".