51693637 has 2 divisors, whose sum is σ = 51693638. Its totient is φ = 51693636.

The previous prime is 51693599. The next prime is 51693641. The reversal of 51693637 is 73639615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34644996 + 17048641 = 5886^2 + 4129^2 .

It is a cyclic number.

It is not a de Polignac number, because 51693637 - 2²³ = 43305029 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51693637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51693667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25846818 + 25846819.

It is an arithmetic number, because the mean of its divisors is an integer number (25846819).

Almost surely, 2^51693637 is an apocalyptic number.

It is an amenable number.

51693637 is a deficient number, since it is larger than the sum of its proper divisors (1).

51693637 is an equidigital number, since it uses as much as digits as its factorization.

51693637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 40.

The square root of 51693637 is about 7189.8287184049. The cubic root of 51693637 is about 372.5166564628.

The spelling of 51693637 in words is "fifty-one million, six hundred ninety-three thousand, six hundred thirty-seven".