90602021 has 2 divisors, whose sum is σ = 90602022. Its totient is φ = 90602020.

The previous prime is 90601997. The next prime is 90602059. The reversal of 90602021 is 12020609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 14737921 = 8710^2 + 3839^2 .

It is an emirp because it is prime and its reverse (12020609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90602021 - 2¹⁰ = 90600997 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90601984 and 90602002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90602081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45301010 + 45301011.

It is an arithmetic number, because the mean of its divisors is an integer number (45301011).

Almost surely, 2^90602021 is an apocalyptic number.

It is an amenable number.

90602021 is a deficient number, since it is larger than the sum of its proper divisors (1).

90602021 is an equidigital number, since it uses as much as digits as its factorization.

90602021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 90602021 is about 9518.5093896051. The cubic root of 90602021 is about 449.1374770614.

The spelling of 90602021 in words is "ninety million, six hundred two thousand, twenty-one".