90203917 has 2 divisors, whose sum is σ = 90203918. Its totient is φ = 90203916.

The previous prime is 90203899. The next prime is 90203941. The reversal of 90203917 is 71930209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81613156 + 8590761 = 9034^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 90203917 - 2¹¹ = 90201869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90203957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45101958 + 45101959.

It is an arithmetic number, because the mean of its divisors is an integer number (45101959).

Almost surely, 2^90203917 is an apocalyptic number.

It is an amenable number.

90203917 is a deficient number, since it is larger than the sum of its proper divisors (1).

90203917 is an equidigital number, since it uses as much as digits as its factorization.

90203917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 90203917 is about 9497.5742692542. The cubic root of 90203917 is about 448.4786766214.

The spelling of 90203917 in words is "ninety million, two hundred three thousand, nine hundred seventeen".