90818452321 has 3 divisors (see below), whose sum is σ = 90818753683. Its totient is φ = 90818150960.

The previous prime is 90818452237. The next prime is 90818452327. The reversal of 90818452321 is 12325481809.

The square root of 90818452321 is 301361.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12325481809 = 139 ⋅88672531.

It can be written as a sum of positive squares in only one way, i.e., 4922565921 + 85895886400 = 70161^2 + 293080^2 .

It is a de Polignac number, because none of the positive numbers 2^k-90818452321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90818452327) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 150681 + ... + 452041.

Almost surely, 2^90818452321 is an apocalyptic number.

90818452321 is the 301361-st square number.

90818452321 is the 150681-st centered octagonal number.

It is an amenable number.

90818452321 is a deficient number, since it is larger than the sum of its proper divisors (301362).

90818452321 is an frugal number, since it uses more digits than its factorization.

90818452321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602722 (or 301361 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 90818452321 in words is "ninety billion, eight hundred eighteen million, four hundred fifty-two thousand, three hundred twenty-one".