90990469 has 2 divisors, whose sum is σ = 90990470. Its totient is φ = 90990468.

The previous prime is 90990457. The next prime is 90990479. The reversal of 90990469 is 96409909.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90954369 + 36100 = 9537^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 90990469 - 2⁹ = 90989957 is a prime.

It is a super-2 number, since 2×90990469² = 16558530897679922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90990479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45495234 + 45495235.

It is an arithmetic number, because the mean of its divisors is an integer number (45495235).

Almost surely, 2^90990469 is an apocalyptic number.

It is an amenable number.

90990469 is a deficient number, since it is larger than the sum of its proper divisors (1).

90990469 is an equidigital number, since it uses as much as digits as its factorization.

90990469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 90990469 is about 9538.8924409493. The cubic root of 90990469 is about 449.7784407266.

It can be divided in two parts, 909 and 90469, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 90990469 in words is "ninety million, nine hundred ninety thousand, four hundred sixty-nine".