90318792617 has 4 divisors (see below), whose sum is σ = 90324064260. Its totient is φ = 90313520976.

The previous prime is 90318792611. The next prime is 90318792623. The reversal of 90318792617 is 71629781309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71629781309 = 613 ⋅116851193.

It is an interprime number because it is at equal distance from previous prime (90318792611) and next prime (90318792623).

It can be written as a sum of positive squares in 2 ways, for example, as 39259063321 + 51059729296 = 198139^2 + 225964^2 .

It is a cyclic number.

It is not a de Polignac number, because 90318792617 - 2³⁴ = 73138923433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90318792611) 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, 2610038 + ... + 2644415.

It is an arithmetic number, because the mean of its divisors is an integer number (22581016065).

Almost surely, 2^90318792617 is an apocalyptic number.

It is an amenable number.

90318792617 is a deficient number, since it is larger than the sum of its proper divisors (5271643).

90318792617 is a wasteful number, since it uses less digits than its factorization.

90318792617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271642.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 90318792617 in words is "ninety billion, three hundred eighteen million, seven hundred ninety-two thousand, six hundred seventeen".