18231098 has 4 divisors (see below), whose sum is σ = 27346650. Its totient is φ = 9115548.

The previous prime is 18231091. The next prime is 18231113. The reversal of 18231098 is 89013281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9628609 + 8602489 = 3103^2 + 2933^2 .

It is not an unprimeable number, because it can be changed into a prime (18231091) 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 as a sum of consecutive naturals, namely, 4557773 + ... + 4557776.

Almost surely, 2^18231098 is an apocalyptic number.

18231098 is a deficient number, since it is larger than the sum of its proper divisors (9115552).

18231098 is an equidigital number, since it uses as much as digits as its factorization.

18231098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9115551.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18231098 is about 4269.7889877604. The cubic root of 18231098 is about 263.1909440471.

The spelling of 18231098 in words is "eighteen million, two hundred thirty-one thousand, ninety-eight".