18310690489 has 27 divisors (see below), whose sum is σ = 23080225167. Its totient is φ = 14477836464.

The previous prime is 18310690483. The next prime is 18310690493. The reversal of 18310690489 is 98409601381.

The square root of 18310690489 is 135317.

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

It can be written as a sum of positive squares in only one way, i.e., 2708682025 + 15602008464 = 52045^2 + 124908^2 .

It is not a de Polignac number, because 18310690489 - 2⁹ = 18310689977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18310690483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12313104 + ... + 12314590.

Almost surely, 2^18310690489 is an apocalyptic number.

18310690489 is the 135317-th square number.

18310690489 is the 67659-th centered octagonal number.

It is an amenable number.

18310690489 is a deficient number, since it is larger than the sum of its proper divisors (4769534678).

18310690489 is an frugal number, since it uses more digits than its factorization.

18310690489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

Multiplying 18310690489 by its sum of digits (49), we get a square (897223833961 = 947219²).

18310690489 divided by its sum of digits (49) gives a square (373687561 = 19331²).

The spelling of 18310690489 in words is "eighteen billion, three hundred ten million, six hundred ninety thousand, four hundred eighty-nine".