91137637 has 2 divisors, whose sum is σ = 91137638. Its totient is φ = 91137636.

The previous prime is 91137601. The next prime is 91137677. The reversal of 91137637 is 73673119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65270241 + 25867396 = 8079^2 + 5086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91137637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91137596 and 91137605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91137677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45568818 + 45568819.

It is an arithmetic number, because the mean of its divisors is an integer number (45568819).

Almost surely, 2^91137637 is an apocalyptic number.

It is an amenable number.

91137637 is a deficient number, since it is larger than the sum of its proper divisors (1).

91137637 is an equidigital number, since it uses as much as digits as its factorization.

91137637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814, while the sum is 37.

The square root of 91137637 is about 9546.6034273976. The cubic root of 91137637 is about 450.0208006846.

The spelling of 91137637 in words is "ninety-one million, one hundred thirty-seven thousand, six hundred thirty-seven".