90874309 has 2 divisors, whose sum is σ = 90874310. Its totient is φ = 90874308.

The previous prime is 90874297. The next prime is 90874319. The reversal of 90874309 is 90347809.

90874309 = T₇₇₈₂ + T₇₇₈₃ + T₇₇₈₄.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75742209 + 15132100 = 8703^2 + 3890^2 .

It is a cyclic number.

It is not a de Polignac number, because 90874309 - 2⁷ = 90874181 is a prime.

It is equal to p_5264788 and since 90874309 and 5264788 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90874319) 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, 45437154 + 45437155.

It is an arithmetic number, because the mean of its divisors is an integer number (45437155).

Almost surely, 2^90874309 is an apocalyptic number.

90874309 is the 7784-th centered triangular number.

It is an amenable number.

90874309 is a deficient number, since it is larger than the sum of its proper divisors (1).

90874309 is an equidigital number, since it uses as much as digits as its factorization.

90874309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 90874309 is about 9532.8017392580. The cubic root of 90874309 is about 449.5869609197.

The spelling of 90874309 in words is "ninety million, eight hundred seventy-four thousand, three hundred nine".