161606231 has 2 divisors, whose sum is σ = 161606232. Its totient is φ = 161606230.

The previous prime is 161606213. The next prime is 161606239. The reversal of 161606231 is 132606161.

Together with previous prime (161606213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161606231 - 2⁶ = 161606167 is a prime.

It is a super-2 number, since 2×161606231² = 52233147796050722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161606231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161606239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80803115 + 80803116.

It is an arithmetic number, because the mean of its divisors is an integer number (80803116).

Almost surely, 2^161606231 is an apocalyptic number.

161606231 is a deficient number, since it is larger than the sum of its proper divisors (1).

161606231 is an equidigital number, since it uses as much as digits as its factorization.

161606231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 161606231 is about 12712.4439428459. The cubic root of 161606231 is about 544.6941369366.

The spelling of 161606231 in words is "one hundred sixty-one million, six hundred six thousand, two hundred thirty-one".