109890081225409 has 3 divisors (see below), whose sum is σ = 109890091708257. Its totient is φ = 109890070742562.

The previous prime is 109890081225383. The next prime is 109890081225433. The reversal of 109890081225409 is 904522180098901.

The square root of 109890081225409 is 10482847.

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 109890081225409 - 2²⁹ = 109889544354497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109890081225499) 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, 5241424 + ... + 15724270.

It is an arithmetic number, because the mean of its divisors is an integer number (36630030569419).

Almost surely, 2^{109890081225409} is an apocalyptic number.

109890081225409 is the 10482847-th square number.

109890081225409 is the 5241424-th centered octagonal number.

It is an amenable number.

109890081225409 is a deficient number, since it is larger than the sum of its proper divisors (10482848).

109890081225409 is an frugal number, since it uses more digits than its factorization.

109890081225409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20965694 (or 10482847 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 58.

The spelling of 109890081225409 in words is "one hundred nine trillion, eight hundred ninety billion, eighty-one million, two hundred twenty-five thousand, four hundred nine".