18679121 has 2 divisors, whose sum is σ = 18679122. Its totient is φ = 18679120.

The previous prime is 18679099. The next prime is 18679181. The reversal of 18679121 is 12197681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11730625 + 6948496 = 3425^2 + 2636^2 .

It is a cyclic number.

It is not a de Polignac number, because 18679121 - 2¹⁸ = 18416977 is a prime.

It is a super-2 number, since 2×18679121² = 697819122665282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18679181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9339560 + 9339561.

It is an arithmetic number, because the mean of its divisors is an integer number (9339561).

Almost surely, 2^18679121 is an apocalyptic number.

It is an amenable number.

18679121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18679121 is an equidigital number, since it uses as much as digits as its factorization.

18679121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 35.

The square root of 18679121 is about 4321.9348676258. The cubic root of 18679121 is about 265.3294632498.

The spelling of 18679121 in words is "eighteen million, six hundred seventy-nine thousand, one hundred twenty-one".