90860621 has 2 divisors, whose sum is σ = 90860622. Its totient is φ = 90860620.

The previous prime is 90860593. The next prime is 90860687. The reversal of 90860621 is 12606809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71588521 + 19272100 = 8461^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 90860621 - 2¹⁰ = 90859597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90860521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45430310 + 45430311.

It is an arithmetic number, because the mean of its divisors is an integer number (45430311).

Almost surely, 2^90860621 is an apocalyptic number.

It is an amenable number.

90860621 is a deficient number, since it is larger than the sum of its proper divisors (1).

90860621 is an equidigital number, since it uses as much as digits as its factorization.

90860621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 90860621 is about 9532.0837700893. The cubic root of 90860621 is about 449.5643866799.

The spelling of 90860621 in words is "ninety million, eight hundred sixty thousand, six hundred twenty-one".