161149331 has 4 divisors (see below), whose sum is σ = 184170672. Its totient is φ = 138127992.

The previous prime is 161149321. The next prime is 161149357. The reversal of 161149331 is 133941161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133941161 = 2267 ⋅59083.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161149331 is a prime.

It is a super-2 number, since 2×161149331² = 51938213763495122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161149294 and 161149303.

It is not an unprimeable number, because it can be changed into a prime (161149321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11510660 + ... + 11510673.

It is an arithmetic number, because the mean of its divisors is an integer number (46042668).

Almost surely, 2^161149331 is an apocalyptic number.

161149331 is a deficient number, since it is larger than the sum of its proper divisors (23021341).

161149331 is an equidigital number, since it uses as much as digits as its factorization.

161149331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23021340.

The product of its digits is 1944, while the sum is 29.

The square root of 161149331 is about 12694.4606423432. The cubic root of 161149331 is about 544.1803249422.

The spelling of 161149331 in words is "one hundred sixty-one million, one hundred forty-nine thousand, three hundred thirty-one".