91904797 has 2 divisors, whose sum is σ = 91904798. Its totient is φ = 91904796.

The previous prime is 91904783. The next prime is 91904819. The reversal of 91904797 is 79740919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84254041 + 7650756 = 9179^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 91904797 - 2¹¹ = 91902749 is a prime.

It is a super-2 number, since 2×91904797² = 16892983423222418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91904497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45952398 + 45952399.

It is an arithmetic number, because the mean of its divisors is an integer number (45952399).

Almost surely, 2^91904797 is an apocalyptic number.

It is an amenable number.

91904797 is a deficient number, since it is larger than the sum of its proper divisors (1).

91904797 is an equidigital number, since it uses as much as digits as its factorization.

91904797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 91904797 is about 9586.6989626252. The cubic root of 91904797 is about 451.2799722778.

The spelling of 91904797 in words is "ninety-one million, nine hundred four thousand, seven hundred ninety-seven".