91507679 has 2 divisors, whose sum is σ = 91507680. Its totient is φ = 91507678.

The previous prime is 91507649. The next prime is 91507687. The reversal of 91507679 is 97670519.

It is a strong prime.

It is an emirp because it is prime and its reverse (97670519) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91507679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91507649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45753839 + 45753840.

It is an arithmetic number, because the mean of its divisors is an integer number (45753840).

Almost surely, 2^91507679 is an apocalyptic number.

91507679 is a deficient number, since it is larger than the sum of its proper divisors (1).

91507679 is an equidigital number, since it uses as much as digits as its factorization.

91507679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 91507679 is about 9565.9646141934. The cubic root of 91507679 is about 450.6290445434.

The spelling of 91507679 in words is "ninety-one million, five hundred seven thousand, six hundred seventy-nine".