90908113 has 2 divisors, whose sum is σ = 90908114. Its totient is φ = 90908112.

The previous prime is 90908107. The next prime is 90908143. The reversal of 90908113 is 31180909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73410624 + 17497489 = 8568^2 + 4183^2 .

It is an emirp because it is prime and its reverse (31180909) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90908113 is a prime.

It is not a weakly prime, because it can be changed into another prime (90908143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45454056 + 45454057.

It is an arithmetic number, because the mean of its divisors is an integer number (45454057).

Almost surely, 2^90908113 is an apocalyptic number.

It is an amenable number.

90908113 is a deficient number, since it is larger than the sum of its proper divisors (1).

90908113 is an equidigital number, since it uses as much as digits as its factorization.

90908113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 90908113 is about 9534.5746103326. The cubic root of 90908113 is about 449.6427007422.

The spelling of 90908113 in words is "ninety million, nine hundred eight thousand, one hundred thirteen".