91900901 has 2 divisors, whose sum is σ = 91900902. Its totient is φ = 91900900.

The previous prime is 91900877. The next prime is 91900903. The reversal of 91900901 is 10900919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68145025 + 23755876 = 8255^2 + 4874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91900901 is a prime.

It is a super-2 number, since 2×91900901² = 16891551209223602, which contains 22 as substring.

Together with 91900903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91900903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45950450 + 45950451.

It is an arithmetic number, because the mean of its divisors is an integer number (45950451).

Almost surely, 2^91900901 is an apocalyptic number.

It is an amenable number.

91900901 is a deficient number, since it is larger than the sum of its proper divisors (1).

91900901 is an equidigital number, since it uses as much as digits as its factorization.

91900901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 91900901 is about 9586.4957622689. The cubic root of 91900901 is about 451.2735953470.

The spelling of 91900901 in words is "ninety-one million, nine hundred thousand, nine hundred one".