90591001 has 4 divisors (see below), whose sum is σ = 90679732. Its totient is φ = 90502272.

The previous prime is 90590989. The next prime is 90591013. The reversal of 90591001 is 10019509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10019509 = 2503 ⋅4003.

It is an interprime number because it is at equal distance from previous prime (90590989) and next prime (90591013).

It can be written as a sum of positive squares in 2 ways, for example, as 89208025 + 1382976 = 9445^2 + 1176^2 .

It is a cyclic number.

It is not a de Polignac number, because 90591001 - 2⁷ = 90590873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90591301) 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, 42816 + ... + 44881.

It is an arithmetic number, because the mean of its divisors is an integer number (22669933).

Almost surely, 2^90591001 is an apocalyptic number.

It is an amenable number.

90591001 is a deficient number, since it is larger than the sum of its proper divisors (88731).

90591001 is a wasteful number, since it uses less digits than its factorization.

90591001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88730.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 90591001 is about 9517.9304998513. The cubic root of 90591001 is about 449.1192666668.

The spelling of 90591001 in words is "ninety million, five hundred ninety-one thousand, one".