90839869 has 2 divisors, whose sum is σ = 90839870. Its totient is φ = 90839868.

The previous prime is 90839867. The next prime is 90839911. The reversal of 90839869 is 96893809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90725625 + 114244 = 9525^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 90839869 - 2¹ = 90839867 is a prime.

It is a super-2 number, since 2×90839869² = 16503763599874322, which contains 22 as substring.

Together with 90839867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90839863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45419934 + 45419935.

It is an arithmetic number, because the mean of its divisors is an integer number (45419935).

Almost surely, 2^90839869 is an apocalyptic number.

It is an amenable number.

90839869 is a deficient number, since it is larger than the sum of its proper divisors (1).

90839869 is an equidigital number, since it uses as much as digits as its factorization.

90839869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 90839869 is about 9530.9951736427. The cubic root of 90839869 is about 449.5301581719.

The spelling of 90839869 in words is "ninety million, eight hundred thirty-nine thousand, eight hundred sixty-nine".