51975557 has 2 divisors, whose sum is σ = 51975558. Its totient is φ = 51975556.

The previous prime is 51975541. The next prime is 51975611. The reversal of 51975557 is 75557915.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50608996 + 1366561 = 7114^2 + 1169^2 .

It is a cyclic number.

It is not a de Polignac number, because 51975557 - 2⁴ = 51975541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51977557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25987778 + 25987779.

It is an arithmetic number, because the mean of its divisors is an integer number (25987779).

Almost surely, 2^51975557 is an apocalyptic number.

It is an amenable number.

51975557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51975557 is an equidigital number, since it uses as much as digits as its factorization.

51975557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275625, while the sum is 44.

The square root of 51975557 is about 7209.4075346037. The cubic root of 51975557 is about 373.1926233298.

The spelling of 51975557 in words is "fifty-one million, nine hundred seventy-five thousand, five hundred fifty-seven".