90840601 has 2 divisors, whose sum is σ = 90840602. Its totient is φ = 90840600.

The previous prime is 90840559. The next prime is 90840623. The reversal of 90840601 is 10604809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80568576 + 10272025 = 8976^2 + 3205^2 .

It is an emirp because it is prime and its reverse (10604809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90840601 - 2⁷ = 90840473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90840601.

It is not a weakly prime, because it can be changed into another prime (90840901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45420300 + 45420301.

It is an arithmetic number, because the mean of its divisors is an integer number (45420301).

Almost surely, 2^90840601 is an apocalyptic number.

It is an amenable number.

90840601 is a deficient number, since it is larger than the sum of its proper divisors (1).

90840601 is an equidigital number, since it uses as much as digits as its factorization.

90840601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 90840601 is about 9531.0335745920. The cubic root of 90840601 is about 449.5313656270.

The spelling of 90840601 in words is "ninety million, eight hundred forty thousand, six hundred one".