901909091 has 2 divisors, whose sum is σ = 901909092. Its totient is φ = 901909090.

The previous prime is 901909061. The next prime is 901909111. The reversal of 901909091 is 190909109.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 901909091 - 2²⁶ = 834800227 is a prime.

It is not a weakly prime, because it can be changed into another prime (901909061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450954545 + 450954546.

It is an arithmetic number, because the mean of its divisors is an integer number (450954546).

Almost surely, 2^901909091 is an apocalyptic number.

901909091 is a deficient number, since it is larger than the sum of its proper divisors (1).

901909091 is an equidigital number, since it uses as much as digits as its factorization.

901909091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 901909091 is about 30031.8013279257. The cubic root of 901909091 is about 966.1715717725.

The spelling of 901909091 in words is "nine hundred one million, nine hundred nine thousand, ninety-one".