51634861 has 2 divisors, whose sum is σ = 51634862. Its totient is φ = 51634860.

The previous prime is 51634859. The next prime is 51634901. The reversal of 51634861 is 16843615.

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., 49970761 + 1664100 = 7069^2 + 1290^2 .

It is a cyclic number.

It is not a de Polignac number, because 51634861 - 2¹ = 51634859 is a prime.

Together with 51634859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51634801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25817430 + 25817431.

It is an arithmetic number, because the mean of its divisors is an integer number (25817431).

Almost surely, 2^51634861 is an apocalyptic number.

It is an amenable number.

51634861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51634861 is an equidigital number, since it uses as much as digits as its factorization.

51634861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 51634861 is about 7185.7401149777. The cubic root of 51634861 is about 372.3754183029.

The spelling of 51634861 in words is "fifty-one million, six hundred thirty-four thousand, eight hundred sixty-one".