90621313 has 4 divisors (see below), whose sum is σ = 91639620. Its totient is φ = 89603008.

The previous prime is 90621301. The next prime is 90621329. The reversal of 90621313 is 31312609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31312609 = 1123 ⋅27883.

It can be written as a sum of positive squares in 2 ways, for example, as 56655729 + 33965584 = 7527^2 + 5828^2 .

It is a cyclic number.

It is not a de Polignac number, because 90621313 - 2⁵ = 90621281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90621613) 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, 509020 + ... + 509197.

It is an arithmetic number, because the mean of its divisors is an integer number (22909905).

Almost surely, 2^90621313 is an apocalyptic number.

It is an amenable number.

90621313 is a deficient number, since it is larger than the sum of its proper divisors (1018307).

90621313 is a wasteful number, since it uses less digits than its factorization.

90621313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018306.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 90621313 is about 9519.5227296330. The cubic root of 90621313 is about 449.1693532646.

The spelling of 90621313 in words is "ninety million, six hundred twenty-one thousand, three hundred thirteen".