90901 has 2 divisors, whose sum is σ = 90902. Its totient is φ = 90900.

The previous prime is 90887. The next prime is 90907. The reversal of 90901 is 10909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62001 + 28900 = 249^2 + 170^2 .

It is an emirp because it is prime and its reverse (10909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90901 - 2¹¹ = 88853 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45450 + 45451.

It is an arithmetic number, because the mean of its divisors is an integer number (45451).

2⁹⁰⁹⁰¹ is an apocalyptic number.

It is an amenable number.

90901 is a deficient number, since it is larger than the sum of its proper divisors (1).

90901 is an equidigital number, since it uses as much as digits as its factorization.

90901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 90901 is about 301.4979270244. The cubic root of 90901 is about 44.9630973179.

The spelling of 90901 in words is "ninety thousand, nine hundred one".