161831429 has 2 divisors, whose sum is σ = 161831430. Its totient is φ = 161831428.

The previous prime is 161831407. The next prime is 161831443. The reversal of 161831429 is 924138161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158508100 + 3323329 = 12590^2 + 1823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161831429 is a prime.

It is a super-2 number, since 2×161831429² = 52378822824364082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161833429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80915714 + 80915715.

It is an arithmetic number, because the mean of its divisors is an integer number (80915715).

Almost surely, 2^161831429 is an apocalyptic number.

It is an amenable number.

161831429 is a deficient number, since it is larger than the sum of its proper divisors (1).

161831429 is an equidigital number, since it uses as much as digits as its factorization.

161831429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 161831429 is about 12721.2982434970. The cubic root of 161831429 is about 544.9470296132.

The spelling of 161831429 in words is "one hundred sixty-one million, eight hundred thirty-one thousand, four hundred twenty-nine".