90910291 has 4 divisors (see below), whose sum is σ = 91454832. Its totient is φ = 90365752.

The previous prime is 90910279. The next prime is 90910301. The reversal of 90910291 is 19201909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19201909 = 643 ⋅29863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90910291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90910241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272020 + ... + 272353.

It is an arithmetic number, because the mean of its divisors is an integer number (22863708).

Almost surely, 2^90910291 is an apocalyptic number.

90910291 is a deficient number, since it is larger than the sum of its proper divisors (544541).

90910291 is a wasteful number, since it uses less digits than its factorization.

90910291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544540.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 90910291 is about 9534.6888255464. The cubic root of 90910291 is about 449.6462915988.

The spelling of 90910291 in words is "ninety million, nine hundred ten thousand, two hundred ninety-one".