161982613 has 16 divisors (see below), whose sum is σ = 185839920. Its totient is φ = 140694528.

The previous prime is 161982589. The next prime is 161982637. The reversal of 161982613 is 316289161.

161982613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161982589) and next prime (161982637).

It can be written as a sum of positive squares in 8 ways, for example, as 137311524 + 24671089 = 11718^2 + 4967^2 .

It is not a de Polignac number, because 161982613 - 2¹⁷ = 161851541 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161982673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35181 + ... + 39517.

It is an arithmetic number, because the mean of its divisors is an integer number (11614995).

Almost surely, 2^161982613 is an apocalyptic number.

161982613 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161982613 is a deficient number, since it is larger than the sum of its proper divisors (23857307).

161982613 is an equidigital number, since it uses as much as digits as its factorization.

161982613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393 (or 4367 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 161982613 is about 12727.2390171631. The cubic root of 161982613 is about 545.1166745125.

The spelling of 161982613 in words is "one hundred sixty-one million, nine hundred eighty-two thousand, six hundred thirteen".