161538829 has 2 divisors, whose sum is σ = 161538830. Its totient is φ = 161538828.

The previous prime is 161538791. The next prime is 161538841. The reversal of 161538829 is 928835161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161340804 + 198025 = 12702^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 161538829 - 2²¹ = 159441677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161538889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80769414 + 80769415.

It is an arithmetic number, because the mean of its divisors is an integer number (80769415).

Almost surely, 2^161538829 is an apocalyptic number.

It is an amenable number.

161538829 is a deficient number, since it is larger than the sum of its proper divisors (1).

161538829 is an equidigital number, since it uses as much as digits as its factorization.

161538829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 161538829 is about 12709.7926418962. The cubic root of 161538829 is about 544.6184002127.

The spelling of 161538829 in words is "one hundred sixty-one million, five hundred thirty-eight thousand, eight hundred twenty-nine".