90910093 has 2 divisors, whose sum is σ = 90910094. Its totient is φ = 90910092.

The previous prime is 90910081. The next prime is 90910097. The reversal of 90910093 is 39001909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87572164 + 3337929 = 9358^2 + 1827^2 .

It is an emirp because it is prime and its reverse (39001909) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90910093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90910097) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45455046 + 45455047.

It is an arithmetic number, because the mean of its divisors is an integer number (45455047).

Almost surely, 2^90910093 is an apocalyptic number.

90910093 is the 5097-th centered heptagonal number.

It is an amenable number.

90910093 is a deficient number, since it is larger than the sum of its proper divisors (1).

90910093 is an equidigital number, since it uses as much as digits as its factorization.

90910093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 90910093 is about 9534.6784424017. The cubic root of 90910093 is about 449.6459651596.

The spelling of 90910093 in words is "ninety million, nine hundred ten thousand, ninety-three".