161239613 has 2 divisors, whose sum is σ = 161239614. Its totient is φ = 161239612.

The previous prime is 161239607. The next prime is 161239619. The reversal of 161239613 is 316932161.

161239613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (161239607) and next prime (161239619).

It can be written as a sum of positive squares in only one way, i.e., 119727364 + 41512249 = 10942^2 + 6443^2 .

It is a cyclic number.

It is not a de Polignac number, because 161239613 - 2⁴ = 161239597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161239613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161239619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80619806 + 80619807.

It is an arithmetic number, because the mean of its divisors is an integer number (80619807).

Almost surely, 2^161239613 is an apocalyptic number.

It is an amenable number.

161239613 is a deficient number, since it is larger than the sum of its proper divisors (1).

161239613 is an equidigital number, since it uses as much as digits as its factorization.

161239613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 161239613 is about 12698.0161048882. The cubic root of 161239613 is about 544.2819294930.

The spelling of 161239613 in words is "one hundred sixty-one million, two hundred thirty-nine thousand, six hundred thirteen".