922900991 has 2 divisors, whose sum is σ = 922900992. Its totient is φ = 922900990.

The previous prime is 922900931. The next prime is 922901011. The reversal of 922900991 is 199009229.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-922900991 is a prime.

It is a Sophie Germain 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 (922900931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 461450495 + 461450496.

It is an arithmetic number, because the mean of its divisors is an integer number (461450496).

Almost surely, 2^922900991 is an apocalyptic number.

922900991 is a deficient number, since it is larger than the sum of its proper divisors (1).

922900991 is an equidigital number, since it uses as much as digits as its factorization.

922900991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 922900991 is about 30379.2855577612. The cubic root of 922900991 is about 973.6100258613.

The spelling of 922900991 in words is "nine hundred twenty-two million, nine hundred thousand, nine hundred ninety-one".