51696637 has 2 divisors, whose sum is σ = 51696638. Its totient is φ = 51696636.

The previous prime is 51696611. The next prime is 51696649. The reversal of 51696637 is 73669615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27154521 + 24542116 = 5211^2 + 4954^2 .

It is a cyclic number.

It is not a de Polignac number, because 51696637 - 2⁷ = 51696509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51696593 and 51696602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51696607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25848318 + 25848319.

It is an arithmetic number, because the mean of its divisors is an integer number (25848319).

Almost surely, 2^51696637 is an apocalyptic number.

It is an amenable number.

51696637 is a deficient number, since it is larger than the sum of its proper divisors (1).

51696637 is an equidigital number, since it uses as much as digits as its factorization.

51696637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 51696637 is about 7190.0373434357. The cubic root of 51696637 is about 372.5238625615.

The spelling of 51696637 in words is "fifty-one million, six hundred ninety-six thousand, six hundred thirty-seven".