51693659 has 2 divisors, whose sum is σ = 51693660. Its totient is φ = 51693658.

The previous prime is 51693641. The next prime is 51693667. The reversal of 51693659 is 95639615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51693659 - 2¹² = 51689563 is a prime.

It is not a weakly prime, because it can be changed into another prime (51693679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25846829 + 25846830.

It is an arithmetic number, because the mean of its divisors is an integer number (25846830).

Almost surely, 2^51693659 is an apocalyptic number.

51693659 is a deficient number, since it is larger than the sum of its proper divisors (1).

51693659 is an equidigital number, since it uses as much as digits as its factorization.

51693659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 218700, while the sum is 44.

The square root of 51693659 is about 7189.8302483438. The cubic root of 51693659 is about 372.5167093086.

The spelling of 51693659 in words is "fifty-one million, six hundred ninety-three thousand, six hundred fifty-nine".