161623439 has 2 divisors, whose sum is σ = 161623440. Its totient is φ = 161623438.

The previous prime is 161623417. The next prime is 161623489. The reversal of 161623439 is 934326161.

It is a happy number.

161623439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161623439 is a prime.

It is a super-2 number, since 2×161623439² = 52244272068373442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161623399 and 161623408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161623489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80811719 + 80811720.

It is an arithmetic number, because the mean of its divisors is an integer number (80811720).

Almost surely, 2^161623439 is an apocalyptic number.

161623439 is a deficient number, since it is larger than the sum of its proper divisors (1).

161623439 is an equidigital number, since it uses as much as digits as its factorization.

161623439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 35.

The square root of 161623439 is about 12713.1207419736. The cubic root of 161623439 is about 544.7134694503.

The spelling of 161623439 in words is "one hundred sixty-one million, six hundred twenty-three thousand, four hundred thirty-nine".