90789409 has 2 divisors, whose sum is σ = 90789410. Its totient is φ = 90789408.

The previous prime is 90789389. The next prime is 90789431. The reversal of 90789409 is 90498709.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86545809 + 4243600 = 9303^2 + 2060^2 .

It is a cyclic number.

It is not a de Polignac number, because 90789409 - 2²¹ = 88692257 is a prime.

It is not a weakly prime, because it can be changed into another prime (90789449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45394704 + 45394705.

It is an arithmetic number, because the mean of its divisors is an integer number (45394705).

Almost surely, 2^90789409 is an apocalyptic number.

It is an amenable number.

90789409 is a deficient number, since it is larger than the sum of its proper divisors (1).

90789409 is an equidigital number, since it uses as much as digits as its factorization.

90789409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 90789409 is about 9528.3476531873. The cubic root of 90789409 is about 449.4469073064.

The spelling of 90789409 in words is "ninety million, seven hundred eighty-nine thousand, four hundred nine".