109890835991689 has 3 divisors (see below), whose sum is σ = 109890846474573. Its totient is φ = 109890825508806.

The previous prime is 109890835991669. The next prime is 109890835991749. The reversal of 109890835991689 is 986199538098901.

The square root of 109890835991689 is 10482883.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 109890835991689 - 2³⁷ = 109753397038217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109890835991669) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5241442 + ... + 15724324.

It is an arithmetic number, because the mean of its divisors is an integer number (36630282158191).

Almost surely, 2^{109890835991689} is an apocalyptic number.

109890835991689 is the 10482883-rd square number.

109890835991689 is the 5241442-nd centered octagonal number.

It is an amenable number.

109890835991689 is a deficient number, since it is larger than the sum of its proper divisors (10482884).

109890835991689 is an frugal number, since it uses more digits than its factorization.

109890835991689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20965766 (or 10482883 counting only the distinct ones).

The product of its (nonzero) digits is 2720977920, while the sum is 85.

The spelling of 109890835991689 in words is "one hundred nine trillion, eight hundred ninety billion, eight hundred thirty-five million, nine hundred ninety-one thousand, six hundred eighty-nine".