90840901 has 2 divisors, whose sum is σ = 90840902. Its totient is φ = 90840900.

The previous prime is 90840857. The next prime is 90840907. The reversal of 90840901 is 10904809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87329025 + 3511876 = 9345^2 + 1874^2 .

It is an emirp because it is prime and its reverse (10904809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90840901 - 2²¹ = 88743749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90840907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45420450 + 45420451.

It is an arithmetic number, because the mean of its divisors is an integer number (45420451).

Almost surely, 2^90840901 is an apocalyptic number.

It is an amenable number.

90840901 is a deficient number, since it is larger than the sum of its proper divisors (1).

90840901 is an equidigital number, since it uses as much as digits as its factorization.

90840901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 90840901 is about 9531.0493126413. The cubic root of 90840901 is about 449.5318604837.

The spelling of 90840901 in words is "ninety million, eight hundred forty thousand, nine hundred one".