90202913 has 2 divisors, whose sum is σ = 90202914. Its totient is φ = 90202912.

The previous prime is 90202909. The next prime is 90202927. The reversal of 90202913 is 31920209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51165409 + 39037504 = 7153^2 + 6248^2 .

It is a cyclic number.

It is not a de Polignac number, because 90202913 - 2² = 90202909 is a prime.

It is not a weakly prime, because it can be changed into another prime (90202943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45101456 + 45101457.

It is an arithmetic number, because the mean of its divisors is an integer number (45101457).

Almost surely, 2^90202913 is an apocalyptic number.

It is an amenable number.

90202913 is a deficient number, since it is larger than the sum of its proper divisors (1).

90202913 is an equidigital number, since it uses as much as digits as its factorization.

90202913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 90202913 is about 9497.5214135057. The cubic root of 90202913 is about 448.4770127089.

The spelling of 90202913 in words is "ninety million, two hundred two thousand, nine hundred thirteen".