90791261 has 12 divisors (see below), whose sum is σ = 102234972. Its totient is φ = 80520000.

The previous prime is 90791227. The next prime is 90791269. The reversal of 90791261 is 16219709.

It can be written as a sum of positive squares in 2 ways, for example, as 2544025 + 88247236 = 1595^2 + 9394^2 .

It is not a de Polignac number, because 90791261 - 2¹⁰ = 90790237 is a prime.

It is a super-4 number, since 4×90791261⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90791269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4190 + ... + 14111.

It is an arithmetic number, because the mean of its divisors is an integer number (8519581).

Almost surely, 2^90791261 is an apocalyptic number.

It is an amenable number.

90791261 is a deficient number, since it is larger than the sum of its proper divisors (11443711).

90791261 is a wasteful number, since it uses less digits than its factorization.

90791261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18364 (or 18353 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 90791261 is about 9528.4448363833. Note that the first 3 decimals coincide. The cubic root of 90791261 is about 449.4499633531.

The spelling of 90791261 in words is "ninety million, seven hundred ninety-one thousand, two hundred sixty-one".