90881069 has 2 divisors, whose sum is σ = 90881070. Its totient is φ = 90881068.

The previous prime is 90881029. The next prime is 90881081. The reversal of 90881069 is 96018809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73324969 + 17556100 = 8563^2 + 4190^2 .

It is an emirp because it is prime and its reverse (96018809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90881069 - 2²⁰ = 89832493 is a prime.

It is a super-2 number, since 2×90881069² = 16518737405165522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90881029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45440534 + 45440535.

It is an arithmetic number, because the mean of its divisors is an integer number (45440535).

Almost surely, 2^90881069 is an apocalyptic number.

It is an amenable number.

90881069 is a deficient number, since it is larger than the sum of its proper divisors (1).

90881069 is an equidigital number, since it uses as much as digits as its factorization.

90881069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 90881069 is about 9533.1562978900. The cubic root of 90881069 is about 449.5981086707.

The spelling of 90881069 in words is "ninety million, eight hundred eighty-one thousand, sixty-nine".