51637697 has 2 divisors, whose sum is σ = 51637698. Its totient is φ = 51637696.

The previous prime is 51637673. The next prime is 51637709. The reversal of 51637697 is 79673615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43349056 + 8288641 = 6584^2 + 2879^2 .

It is a cyclic number.

It is not a de Polignac number, because 51637697 - 2⁶ = 51637633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51637627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25818848 + 25818849.

It is an arithmetic number, because the mean of its divisors is an integer number (25818849).

Almost surely, 2^51637697 is an apocalyptic number.

It is an amenable number.

51637697 is a deficient number, since it is larger than the sum of its proper divisors (1).

51637697 is an equidigital number, since it uses as much as digits as its factorization.

51637697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 51637697 is about 7185.9374475429. The cubic root of 51637697 is about 372.3822356438.

The spelling of 51637697 in words is "fifty-one million, six hundred thirty-seven thousand, six hundred ninety-seven".