890908922509 has 2 divisors, whose sum is σ = 890908922510. Its totient is φ = 890908922508.

The previous prime is 890908922473. The next prime is 890908922513. The reversal of 890908922509 is 905229809098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 715678776484 + 175230146025 = 845978^2 + 418605^2 .

It is a cyclic number.

It is not a de Polignac number, because 890908922509 - 2⁷ = 890908922381 is a prime.

It is a super-2 number, since 2×890908922509² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (890908922809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445454461254 + 445454461255.

It is an arithmetic number, because the mean of its divisors is an integer number (445454461255).

Almost surely, 2^890908922509 is an apocalyptic number.

It is an amenable number.

890908922509 is a deficient number, since it is larger than the sum of its proper divisors (1).

890908922509 is an equidigital number, since it uses as much as digits as its factorization.

890908922509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8398080, while the sum is 61.

The spelling of 890908922509 in words is "eight hundred ninety billion, nine hundred eight million, nine hundred twenty-two thousand, five hundred nine".