91506757 has 2 divisors, whose sum is σ = 91506758. Its totient is φ = 91506756.

The previous prime is 91506739. The next prime is 91506773. The reversal of 91506757 is 75760519.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91221601 + 285156 = 9551^2 + 534^2 .

It is a cyclic number.

It is not a de Polignac number, because 91506757 - 2¹¹ = 91504709 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 (91506787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45753378 + 45753379.

It is an arithmetic number, because the mean of its divisors is an integer number (45753379).

Almost surely, 2^91506757 is an apocalyptic number.

It is an amenable number.

91506757 is a deficient number, since it is larger than the sum of its proper divisors (1).

91506757 is an equidigital number, since it uses as much as digits as its factorization.

91506757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66150, while the sum is 40.

The square root of 91506757 is about 9565.9164223821. The cubic root of 91506757 is about 450.6275310770.

The spelling of 91506757 in words is "ninety-one million, five hundred six thousand, seven hundred fifty-seven".