51057917 has 4 divisors (see below), whose sum is σ = 51081600. Its totient is φ = 51034236.

The previous prime is 51057913. The next prime is 51057931. The reversal of 51057917 is 71975015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51057917 - 2² = 51057913 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 (51057911) 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, 8243 + ... + 13040.

It is an arithmetic number, because the mean of its divisors is an integer number (12770400).

Almost surely, 2^51057917 is an apocalyptic number.

It is an amenable number.

51057917 is a deficient number, since it is larger than the sum of its proper divisors (23683).

51057917 is a wasteful number, since it uses less digits than its factorization.

51057917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23682.

The product of its (nonzero) digits is 11025, while the sum is 35.

The square root of 51057917 is about 7145.4822790348. The cubic root of 51057917 is about 370.9833036419.

The spelling of 51057917 in words is "fifty-one million, fifty-seven thousand, nine hundred seventeen".