51680557 has 2 divisors, whose sum is σ = 51680558. Its totient is φ = 51680556.

The previous prime is 51680521. The next prime is 51680567. The reversal of 51680557 is 75508615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35832196 + 15848361 = 5986^2 + 3981^2 .

It is a cyclic number.

It is not a de Polignac number, because 51680557 - 2⁷ = 51680429 is a prime.

It is a super-3 number, since 3×51680557³ (a number of 24 digits) contains 333 as substring.

It is equal to p_3095794 and since 51680557 and 3095794 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51680567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25840278 + 25840279.

It is an arithmetic number, because the mean of its divisors is an integer number (25840279).

Almost surely, 2^51680557 is an apocalyptic number.

It is an amenable number.

51680557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51680557 is an equidigital number, since it uses as much as digits as its factorization.

51680557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42000, while the sum is 37.

The square root of 51680557 is about 7188.9190425265. The cubic root of 51680557 is about 372.4852346143.

The spelling of 51680557 in words is "fifty-one million, six hundred eighty thousand, five hundred fifty-seven".