909091002261 has 32 divisors (see below), whose sum is σ = 1307965075200. Its totient is φ = 558325407744.

The previous prime is 909091002223. The next prime is 909091002299. The reversal of 909091002261 is 162200190909.

It is an interprime number because it is at equal distance from previous prime (909091002223) and next prime (909091002299).

It is not a de Polignac number, because 909091002261 - 2²⁶ = 909023893397 is a prime.

It is a super-2 number, since 2×909091002261² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909091002161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124580565 + ... + 124587861.

It is an arithmetic number, because the mean of its divisors is an integer number (40873908600).

Almost surely, 2^909091002261 is an apocalyptic number.

It is an amenable number.

909091002261 is a deficient number, since it is larger than the sum of its proper divisors (398874072939).

909091002261 is a wasteful number, since it uses less digits than its factorization.

909091002261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13245.

The product of its (nonzero) digits is 17496, while the sum is 39.

The spelling of 909091002261 in words is "nine hundred nine billion, ninety-one million, two thousand, two hundred sixty-one".