90902789 has 2 divisors, whose sum is σ = 90902790. Its totient is φ = 90902788.

The previous prime is 90902767. The next prime is 90902797. The reversal of 90902789 is 98720909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87572164 + 3330625 = 9358^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 90902789 - 2⁸ = 90902533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90904789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45451394 + 45451395.

It is an arithmetic number, because the mean of its divisors is an integer number (45451395).

Almost surely, 2^90902789 is an apocalyptic number.

It is an amenable number.

90902789 is a deficient number, since it is larger than the sum of its proper divisors (1).

90902789 is an equidigital number, since it uses as much as digits as its factorization.

90902789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 90902789 is about 9534.2954118278. The cubic root of 90902789 is about 449.6339228514.

The spelling of 90902789 in words is "ninety million, nine hundred two thousand, seven hundred eighty-nine".