51890557 has 2 divisors, whose sum is σ = 51890558. Its totient is φ = 51890556.

The previous prime is 51890519. The next prime is 51890567. The reversal of 51890557 is 75509815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44809636 + 7080921 = 6694^2 + 2661^2 .

It is a cyclic number.

It is not a de Polignac number, because 51890557 - 2⁷ = 51890429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51890567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25945278 + 25945279.

It is an arithmetic number, because the mean of its divisors is an integer number (25945279).

Almost surely, 2^51890557 is an apocalyptic number.

It is an amenable number.

51890557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51890557 is an equidigital number, since it uses as much as digits as its factorization.

51890557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 51890557 is about 7203.5100471923. The cubic root of 51890557 is about 372.9890745673.

The spelling of 51890557 in words is "fifty-one million, eight hundred ninety thousand, five hundred fifty-seven".