91655537 has 2 divisors, whose sum is σ = 91655538. Its totient is φ = 91655536.

The previous prime is 91655527. The next prime is 91655567. The reversal of 91655537 is 73555619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77510416 + 14145121 = 8804^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 91655537 - 2⁴ = 91655521 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91655494 and 91655503.

It is not a weakly prime, because it can be changed into another prime (91655527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45827768 + 45827769.

It is an arithmetic number, because the mean of its divisors is an integer number (45827769).

Almost surely, 2^91655537 is an apocalyptic number.

It is an amenable number.

91655537 is a deficient number, since it is larger than the sum of its proper divisors (1).

91655537 is an equidigital number, since it uses as much as digits as its factorization.

91655537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141750, while the sum is 41.

The square root of 91655537 is about 9573.6898320345. The cubic root of 91655537 is about 450.8716225644.

The spelling of 91655537 in words is "ninety-one million, six hundred fifty-five thousand, five hundred thirty-seven".