91202971 has 2 divisors, whose sum is σ = 91202972. Its totient is φ = 91202970.

The previous prime is 91202953. The next prime is 91202987. The reversal of 91202971 is 17920219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91202971 - 2¹⁹ = 90678683 is a prime.

It is not a weakly prime, because it can be changed into another prime (91209971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45601485 + 45601486.

It is an arithmetic number, because the mean of its divisors is an integer number (45601486).

Almost surely, 2^91202971 is an apocalyptic number.

91202971 is a deficient number, since it is larger than the sum of its proper divisors (1).

91202971 is an equidigital number, since it uses as much as digits as its factorization.

91202971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 91202971 is about 9550.0246596540. The cubic root of 91202971 is about 450.1283107357.

The spelling of 91202971 in words is "ninety-one million, two hundred two thousand, nine hundred seventy-one".