90697613 has 4 divisors (see below), whose sum is σ = 91050780. Its totient is φ = 90344448.

The previous prime is 90697603. The next prime is 90697631. The reversal of 90697613 is 31679609.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31679609 = 13 ⋅2436893.

It can be written as a sum of positive squares in 2 ways, for example, as 65966884 + 24730729 = 8122^2 + 4973^2 .

It is a cyclic number.

It is not a de Polignac number, because 90697613 - 2⁴ = 90697597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90697603) 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, 176198 + ... + 176711.

It is an arithmetic number, because the mean of its divisors is an integer number (22762695).

Almost surely, 2^90697613 is an apocalyptic number.

It is an amenable number.

90697613 is a deficient number, since it is larger than the sum of its proper divisors (353167).

90697613 is a wasteful number, since it uses less digits than its factorization.

90697613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353166.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 90697613 is about 9523.5294402863. The cubic root of 90697613 is about 449.2953795694.

The spelling of 90697613 in words is "ninety million, six hundred ninety-seven thousand, six hundred thirteen".