51942517 has 6 divisors (see below), whose sum is σ = 57093974. Its totient is φ = 47220360.

The previous prime is 51942461. The next prime is 51942521. The reversal of 51942517 is 71524915.

It can be written as a sum of positive squares in only one way, i.e., 51279921 + 662596 = 7161^2 + 814^2 .

It is not a de Polignac number, because 51942517 - 2⁷ = 51942389 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 (51942547) 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, 214518 + ... + 214759.

Almost surely, 2^51942517 is an apocalyptic number.

It is an amenable number.

51942517 is a deficient number, since it is larger than the sum of its proper divisors (5151457).

51942517 is a wasteful number, since it uses less digits than its factorization.

51942517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429299 (or 429288 counting only the distinct ones).

The product of its digits is 12600, while the sum is 34.

The square root of 51942517 is about 7207.1157198979. The cubic root of 51942517 is about 373.1135291130.

The spelling of 51942517 in words is "fifty-one million, nine hundred forty-two thousand, five hundred seventeen".