91517479 has 2 divisors, whose sum is σ = 91517480. Its totient is φ = 91517478.

The previous prime is 91517473. The next prime is 91517497. The reversal of 91517479 is 97471519.

Together with next prime (91517497) 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 not a de Polignac number, because 91517479 - 2⁷ = 91517351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91517473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45758739 + 45758740.

It is an arithmetic number, because the mean of its divisors is an integer number (45758740).

Almost surely, 2^91517479 is an apocalyptic number.

91517479 is a deficient number, since it is larger than the sum of its proper divisors (1).

91517479 is an equidigital number, since it uses as much as digits as its factorization.

91517479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 43.

The square root of 91517479 is about 9566.4768331920. The cubic root of 91517479 is about 450.6451306505.

The spelling of 91517479 in words is "ninety-one million, five hundred seventeen thousand, four hundred seventy-nine".