18531673 has 2 divisors, whose sum is σ = 18531674. Its totient is φ = 18531672.

The previous prime is 18531641. The next prime is 18531703. The reversal of 18531673 is 37613581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12166144 + 6365529 = 3488^2 + 2523^2 .

It is a cyclic number.

It is not a de Polignac number, because 18531673 - 2⁵ = 18531641 is a prime.

It is not a weakly prime, because it can be changed into another prime (18531613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9265836 + 9265837.

It is an arithmetic number, because the mean of its divisors is an integer number (9265837).

Almost surely, 2^18531673 is an apocalyptic number.

It is an amenable number.

18531673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18531673 is an equidigital number, since it uses as much as digits as its factorization.

18531673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 18531673 is about 4304.8429704230. The cubic root of 18531673 is about 264.6294714808.

The spelling of 18531673 in words is "eighteen million, five hundred thirty-one thousand, six hundred seventy-three".