161432231 has 2 divisors, whose sum is σ = 161432232. Its totient is φ = 161432230.

The previous prime is 161432213. The next prime is 161432251. The reversal of 161432231 is 132234161.

Together with previous prime (161432213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161432231 - 2¹⁴ = 161415847 is a prime.

It is a super-2 number, since 2×161432231² = 52120730411274722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161432197 and 161432206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161432251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80716115 + 80716116.

It is an arithmetic number, because the mean of its divisors is an integer number (80716116).

Almost surely, 2^161432231 is an apocalyptic number.

161432231 is a deficient number, since it is larger than the sum of its proper divisors (1).

161432231 is an equidigital number, since it uses as much as digits as its factorization.

161432231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 161432231 is about 12705.5984117239. The cubic root of 161432231 is about 544.4985776137.

Adding to 161432231 its reverse (132234161), we get a palindrome (293666392).

The spelling of 161432231 in words is "one hundred sixty-one million, four hundred thirty-two thousand, two hundred thirty-one".