90064591 has 2 divisors, whose sum is σ = 90064592. Its totient is φ = 90064590.

The previous prime is 90064567. The next prime is 90064627. The reversal of 90064591 is 19546009.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90064591 - 2¹¹ = 90062543 is a prime.

It is a super-2 number, since 2×90064591² = 16223261103994562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90064501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45032295 + 45032296.

It is an arithmetic number, because the mean of its divisors is an integer number (45032296).

Almost surely, 2^90064591 is an apocalyptic number.

90064591 is a deficient number, since it is larger than the sum of its proper divisors (1).

90064591 is an equidigital number, since it uses as much as digits as its factorization.

90064591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 90064591 is about 9490.2366145423. The cubic root of 90064591 is about 448.2476558393.

The spelling of 90064591 in words is "ninety million, sixty-four thousand, five hundred ninety-one".