90923621 has 2 divisors, whose sum is σ = 90923622. Its totient is φ = 90923620.

The previous prime is 90923597. The next prime is 90923639. The reversal of 90923621 is 12632909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90916225 + 7396 = 9535^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 90923621 - 2¹⁸ = 90661477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90923641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45461810 + 45461811.

It is an arithmetic number, because the mean of its divisors is an integer number (45461811).

Almost surely, 2^90923621 is an apocalyptic number.

It is an amenable number.

90923621 is a deficient number, since it is larger than the sum of its proper divisors (1).

90923621 is an equidigital number, since it uses as much as digits as its factorization.

90923621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 90923621 is about 9535.3878264075. The cubic root of 90923621 is about 449.6682674465.

The spelling of 90923621 in words is "ninety million, nine hundred twenty-three thousand, six hundred twenty-one".