109390681 has 3 divisors (see below), whose sum is σ = 109401141. Its totient is φ = 109380222.

The previous prime is 109390627. The next prime is 109390693. The reversal of 109390681 is 186093901.

The square root of 109390681 is 10459.

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 109390681 - 2¹⁷ = 109259609 is a prime.

It is a super-2 number, since 2×109390681² = 23932642179287522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109390681.

It is not an unprimeable number, because it can be changed into a prime (109390621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5230 + ... + 15688.

It is an arithmetic number, because the mean of its divisors is an integer number (36467047).

Almost surely, 2^109390681 is an apocalyptic number.

109390681 is the 10459-th square number.

109390681 is the 5230-th centered octagonal number.

It is an amenable number.

109390681 is a deficient number, since it is larger than the sum of its proper divisors (10460).

109390681 is an frugal number, since it uses more digits than its factorization.

109390681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20918 (or 10459 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The cubic root of 109390681 is about 478.2556492096.

Multiplying 109390681 by its product of nonzero digits (11664), we get a square (1275932903184 = 1129572²).

The spelling of 109390681 in words is "one hundred nine million, three hundred ninety thousand, six hundred eighty-one".