51691559 has 2 divisors, whose sum is σ = 51691560. Its totient is φ = 51691558.

The previous prime is 51691537. The next prime is 51691567. The reversal of 51691559 is 95519615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51691559 is a prime.

It is a super-3 number, since 3×51691559³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51691579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25845779 + 25845780.

It is an arithmetic number, because the mean of its divisors is an integer number (25845780).

Almost surely, 2^51691559 is an apocalyptic number.

51691559 is a deficient number, since it is larger than the sum of its proper divisors (1).

51691559 is an equidigital number, since it uses as much as digits as its factorization.

51691559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 41.

The square root of 51691559 is about 7189.6842072514. The cubic root of 51691559 is about 372.5116648750.

The spelling of 51691559 in words is "fifty-one million, six hundred ninety-one thousand, five hundred fifty-nine".