51887117 has 4 divisors (see below), whose sum is σ = 52034460. Its totient is φ = 51739776.

The previous prime is 51887113. The next prime is 51887123. The reversal of 51887117 is 71178815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17147881 + 34739236 = 4141^2 + 5894^2 .

It is a cyclic number.

It is not a de Polignac number, because 51887117 - 2² = 51887113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51887113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73142 + ... + 73847.

It is an arithmetic number, because the mean of its divisors is an integer number (13008615).

Almost surely, 2^51887117 is an apocalyptic number.

It is an amenable number.

51887117 is a deficient number, since it is larger than the sum of its proper divisors (147343).

51887117 is a wasteful number, since it uses less digits than its factorization.

51887117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147342.

The product of its digits is 15680, while the sum is 38.

The square root of 51887117 is about 7203.2712707491. The cubic root of 51887117 is about 372.9808321507.

The spelling of 51887117 in words is "fifty-one million, eight hundred eighty-seven thousand, one hundred seventeen".