90835621 has 2 divisors, whose sum is σ = 90835622. Its totient is φ = 90835620.

The previous prime is 90835603. The next prime is 90835669. The reversal of 90835621 is 12653809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 42380100 = 6961^2 + 6510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90835621 is a prime.

It is a super-2 number, since 2×90835621² = 16502220084911282, which contains 22 as substring.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90835601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45417810 + 45417811.

It is an arithmetic number, because the mean of its divisors is an integer number (45417811).

Almost surely, 2^90835621 is an apocalyptic number.

It is an amenable number.

90835621 is a deficient number, since it is larger than the sum of its proper divisors (1).

90835621 is an equidigital number, since it uses as much as digits as its factorization.

90835621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 90835621 is about 9530.7723191775. The cubic root of 90835621 is about 449.5231508453.

The spelling of 90835621 in words is "ninety million, eight hundred thirty-five thousand, six hundred twenty-one".