161238439 has 2 divisors, whose sum is σ = 161238440. Its totient is φ = 161238438.

The previous prime is 161238437. The next prime is 161238443. The reversal of 161238439 is 934832161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161238439 - 2¹ = 161238437 is a prime.

It is a super-2 number, since 2×161238439² = 51995668422313442, which contains 22 as substring.

Together with 161238437, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 161238398 and 161238407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161238431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80619219 + 80619220.

It is an arithmetic number, because the mean of its divisors is an integer number (80619220).

Almost surely, 2^161238439 is an apocalyptic number.

161238439 is a deficient number, since it is larger than the sum of its proper divisors (1).

161238439 is an equidigital number, since it uses as much as digits as its factorization.

161238439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 161238439 is about 12697.9698771103. The cubic root of 161238439 is about 544.2806085014.

The spelling of 161238439 in words is "one hundred sixty-one million, two hundred thirty-eight thousand, four hundred thirty-nine".