91164779 has 2 divisors, whose sum is σ = 91164780. Its totient is φ = 91164778.

The previous prime is 91164767. The next prime is 91164797. The reversal of 91164779 is 97746119.

Together with next prime (91164797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91164779 is a prime.

It is a super-2 number, since 2×91164779² = 16622033860237682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91164739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45582389 + 45582390.

It is an arithmetic number, because the mean of its divisors is an integer number (45582390).

Almost surely, 2^91164779 is an apocalyptic number.

91164779 is a deficient number, since it is larger than the sum of its proper divisors (1).

91164779 is an equidigital number, since it uses as much as digits as its factorization.

91164779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 44.

The square root of 91164779 is about 9548.0248742868. The cubic root of 91164779 is about 450.0654703097.

The spelling of 91164779 in words is "ninety-one million, one hundred sixty-four thousand, seven hundred seventy-nine".