90209723 has 2 divisors, whose sum is σ = 90209724. Its totient is φ = 90209722.

The previous prime is 90209699. The next prime is 90209731. The reversal of 90209723 is 32790209.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90209723 - 2¹⁸ = 89947579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90209723.

It is not a weakly prime, because it can be changed into another prime (90209753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45104861 + 45104862.

It is an arithmetic number, because the mean of its divisors is an integer number (45104862).

Almost surely, 2^90209723 is an apocalyptic number.

90209723 is a deficient number, since it is larger than the sum of its proper divisors (1).

90209723 is an equidigital number, since it uses as much as digits as its factorization.

90209723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 90209723 is about 9497.8799213298. The cubic root of 90209723 is about 448.4882985662.

The spelling of 90209723 in words is "ninety million, two hundred nine thousand, seven hundred twenty-three".