181914013 has 4 divisors (see below), whose sum is σ = 188186940. Its totient is φ = 175641088.

The previous prime is 181914001. The next prime is 181914023. The reversal of 181914013 is 310419181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310419181 = 643 ⋅482767.

It can be written as a sum of positive squares in 2 ways, for example, as 130462084 + 51451929 = 11422^2 + 7173^2 .

It is a cyclic number.

It is not a de Polignac number, because 181914013 - 2⁵ = 181913981 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 (181914023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3136420 + ... + 3136477.

It is an arithmetic number, because the mean of its divisors is an integer number (47046735).

Almost surely, 2^181914013 is an apocalyptic number.

It is an amenable number.

181914013 is a deficient number, since it is larger than the sum of its proper divisors (6272927).

181914013 is an equidigital number, since it uses as much as digits as its factorization.

181914013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6272926.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 181914013 is about 13487.5502964771. The cubic root of 181914013 is about 566.6158489992.

The spelling of 181914013 in words is "one hundred eighty-one million, nine hundred fourteen thousand, thirteen".