18461313 has 24 divisors (see below), whose sum is σ = 29713320. Its totient is φ = 10967040.

The previous prime is 18461309. The next prime is 18461327. The reversal of 18461313 is 31316481.

It can be written as a sum of positive squares in 4 ways, for example, as 1912689 + 16548624 = 1383^2 + 4068^2 .

It is not a de Polignac number, because 18461313 - 2² = 18461309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18461353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 673 + ... + 6113.

It is an arithmetic number, because the mean of its divisors is an integer number (1238055).

Almost surely, 2^18461313 is an apocalyptic number.

18461313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18461313 is a deficient number, since it is larger than the sum of its proper divisors (11252007).

18461313 is a wasteful number, since it uses less digits than its factorization.

18461313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489 (or 5486 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 18461313 is about 4296.6630074978. The cubic root of 18461313 is about 264.2941366964.

Adding to 18461313 its reverse (31316481), we get a palindrome (49777794).

The spelling of 18461313 in words is "eighteen million, four hundred sixty-one thousand, three hundred thirteen".