161361145 has 16 divisors (see below), whose sum is σ = 211821120. Its totient is φ = 117028800.

The previous prime is 161361113. The next prime is 161361163. The reversal of 161361145 is 541163161.

It is not a de Polignac number, because 161361145 - 2⁵ = 161361113 is a prime.

It is a super-2 number, since 2×161361145² = 52074838231422050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16975 + ... + 24715.

It is an arithmetic number, because the mean of its divisors is an integer number (13238820).

Almost surely, 2^161361145 is an apocalyptic number.

It is an amenable number.

161361145 is a deficient number, since it is larger than the sum of its proper divisors (50459975).

161361145 is a wasteful number, since it uses less digits than its factorization.

161361145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8136.

The product of its digits is 2160, while the sum is 28.

The square root of 161361145 is about 12702.8006754416. The cubic root of 161361145 is about 544.4186433313.

The spelling of 161361145 in words is "one hundred sixty-one million, three hundred sixty-one thousand, one hundred forty-five".