51523861 has 2 divisors, whose sum is σ = 51523862. Its totient is φ = 51523860.

The previous prime is 51523853. The next prime is 51523873. The reversal of 51523861 is 16832515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50324836 + 1199025 = 7094^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 51523861 - 2³ = 51523853 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 (51523061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25761930 + 25761931.

It is an arithmetic number, because the mean of its divisors is an integer number (25761931).

Almost surely, 2^51523861 is an apocalyptic number.

It is an amenable number.

51523861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51523861 is an equidigital number, since it uses as much as digits as its factorization.

51523861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 51523861 is about 7178.0123293291. The cubic root of 51523861 is about 372.1083937609.

The spelling of 51523861 in words is "fifty-one million, five hundred twenty-three thousand, eight hundred sixty-one".