161234945 has 16 divisors (see below), whose sum is σ = 202424832. Its totient is φ = 123055680.

The previous prime is 161234939. The next prime is 161234947. The reversal of 161234945 is 549432161.

It is not a de Polignac number, because 161234945 - 2⁴ = 161234929 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161234947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47939 + ... + 51191.

It is an arithmetic number, because the mean of its divisors is an integer number (12651552).

It is a Proth number, since it is equal to 9841 ⋅ 2¹⁴ + 1 and 9841 < 2¹⁴.

Almost surely, 2^161234945 is an apocalyptic number.

It is an amenable number.

161234945 is a deficient number, since it is larger than the sum of its proper divisors (41189887).

161234945 is a wasteful number, since it uses less digits than its factorization.

161234945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712.

The product of its digits is 25920, while the sum is 35.

The square root of 161234945 is about 12697.8322953172. The cubic root of 161234945 is about 544.2766769943.

The spelling of 161234945 in words is "one hundred sixty-one million, two hundred thirty-four thousand, nine hundred forty-five".