18148931 has 4 divisors (see below), whose sum is σ = 18456600. Its totient is φ = 17841264.

The previous prime is 18148901. The next prime is 18148939. The reversal of 18148931 is 13984181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13984181 = 443 ⋅31567.

It is a cyclic number.

It is not a de Polignac number, because 18148931 - 2¹⁸ = 17886787 is a prime.

It is a super-2 number, since 2×18148931² = 658767392885522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18148891 and 18148900.

It is not an unprimeable number, because it can be changed into a prime (18148939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153746 + ... + 153863.

It is an arithmetic number, because the mean of its divisors is an integer number (4614150).

Almost surely, 2^18148931 is an apocalyptic number.

18148931 is a deficient number, since it is larger than the sum of its proper divisors (307669).

18148931 is an equidigital number, since it uses as much as digits as its factorization.

18148931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307668.

The product of its digits is 6912, while the sum is 35.

The square root of 18148931 is about 4260.1562177930. The cubic root of 18148931 is about 262.7949507002.

The spelling of 18148931 in words is "eighteen million, one hundred forty-eight thousand, nine hundred thirty-one".