91758413 has 2 divisors, whose sum is σ = 91758414. Its totient is φ = 91758412.

The previous prime is 91758397. The next prime is 91758427. The reversal of 91758413 is 31485719.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88021924 + 3736489 = 9382^2 + 1933^2 .

It is a cyclic number.

It is not a de Polignac number, because 91758413 - 2⁴ = 91758397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91758313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45879206 + 45879207.

It is an arithmetic number, because the mean of its divisors is an integer number (45879207).

Almost surely, 2^91758413 is an apocalyptic number.

It is an amenable number.

91758413 is a deficient number, since it is larger than the sum of its proper divisors (1).

91758413 is an equidigital number, since it uses as much as digits as its factorization.

91758413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 91758413 is about 9579.0611752927. The cubic root of 91758413 is about 451.0402485864.

The spelling of 91758413 in words is "ninety-one million, seven hundred fifty-eight thousand, four hundred thirteen".