90291517 has 2 divisors, whose sum is σ = 90291518. Its totient is φ = 90291516.

The previous prime is 90291511. The next prime is 90291521. The reversal of 90291517 is 71519209.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90231001 + 60516 = 9499^2 + 246^2 .

It is an emirp because it is prime and its reverse (71519209) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90291517 is a prime.

It is a super-2 number, since 2×90291517² = 16305116084322578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90291511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45145758 + 45145759.

It is an arithmetic number, because the mean of its divisors is an integer number (45145759).

Almost surely, 2^90291517 is an apocalyptic number.

It is an amenable number.

90291517 is a deficient number, since it is larger than the sum of its proper divisors (1).

90291517 is an equidigital number, since it uses as much as digits as its factorization.

90291517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 90291517 is about 9502.1848540217. The cubic root of 90291517 is about 448.6238071312.

The spelling of 90291517 in words is "ninety million, two hundred ninety-one thousand, five hundred seventeen".