161395231 has 2 divisors, whose sum is σ = 161395232. Its totient is φ = 161395230.

The previous prime is 161395193. The next prime is 161395261. The reversal of 161395231 is 132593161.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (132593161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161395231 - 2²⁷ = 27177503 is a prime.

It is a super-2 number, since 2×161395231² = 52096841179086722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_9048325 and since 161395231 and 9048325 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 161395193 and 161395202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161395261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80697615 + 80697616.

It is an arithmetic number, because the mean of its divisors is an integer number (80697616).

Almost surely, 2^161395231 is an apocalyptic number.

161395231 is a deficient number, since it is larger than the sum of its proper divisors (1).

161395231 is an equidigital number, since it uses as much as digits as its factorization.

161395231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 31.

The square root of 161395231 is about 12704.1422772260. The cubic root of 161395231 is about 544.4569750444.

The spelling of 161395231 in words is "one hundred sixty-one million, three hundred ninety-five thousand, two hundred thirty-one".