18161013 has 16 divisors (see below), whose sum is σ = 26438720. Its totient is φ = 11021184.

The previous prime is 18160999. The next prime is 18161023. The reversal of 18161013 is 31016181.

It is not a de Polignac number, because 18161013 - 2⁶ = 18160949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161023) 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 in 15 ways as a sum of consecutive naturals, for example, 343 + ... + 6036.

It is an arithmetic number, because the mean of its divisors is an integer number (1652420).

Almost surely, 2^18161013 is an apocalyptic number.

18161013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18161013 is a deficient number, since it is larger than the sum of its proper divisors (8277707).

18161013 is a wasteful number, since it uses less digits than its factorization.

18161013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6468.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 18161013 is about 4261.5740049892. The cubic root of 18161013 is about 262.8532532027.

Adding to 18161013 its reverse (31016181), we get a palindrome (49177194).

The spelling of 18161013 in words is "eighteen million, one hundred sixty-one thousand, thirteen".