51898717 has 6 divisors (see below), whose sum is σ = 56198202. Its totient is φ = 47906352.

The previous prime is 51898699. The next prime is 51898727. The reversal of 51898717 is 71789815.

It can be written as a sum of positive squares in 3 ways, for example, as 4756761 + 47141956 = 2181^2 + 6866^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51898717 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 (51898727) 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, 153378 + ... + 153715.

It is an arithmetic number, because the mean of its divisors is an integer number (9366367).

Almost surely, 2^51898717 is an apocalyptic number.

It is an amenable number.

51898717 is a deficient number, since it is larger than the sum of its proper divisors (4299485).

51898717 is a wasteful number, since it uses less digits than its factorization.

51898717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307119 (or 307106 counting only the distinct ones).

The product of its digits is 141120, while the sum is 46.

The square root of 51898717 is about 7204.0764154748. The cubic root of 51898717 is about 373.0086248895.

It can be divided in two parts, 518 and 98717, that added together give a triangular number (99235 = T₄₄₅).

The spelling of 51898717 in words is "fifty-one million, eight hundred ninety-eight thousand, seven hundred seventeen".