90020501 has 2 divisors, whose sum is σ = 90020502. Its totient is φ = 90020500.

The previous prime is 90020479. The next prime is 90020527. The reversal of 90020501 is 10502009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88642225 + 1378276 = 9415^2 + 1174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90020501 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90020501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90020561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45010250 + 45010251.

It is an arithmetic number, because the mean of its divisors is an integer number (45010251).

Almost surely, 2^90020501 is an apocalyptic number.

It is an amenable number.

90020501 is a deficient number, since it is larger than the sum of its proper divisors (1).

90020501 is an equidigital number, since it uses as much as digits as its factorization.

90020501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 90020501 is about 9487.9134165527. The cubic root of 90020501 is about 448.1744992126.

The spelling of 90020501 in words is "ninety million, twenty thousand, five hundred one".