161155143 has 16 divisors (see below), whose sum is σ = 246451200. Its totient is φ = 103970520.

The previous prime is 161155129. The next prime is 161155147. The reversal of 161155143 is 341551161.

161155143 is a `hidden beast` number, since 1 + 611 + 5 + 5 + 1 + 43 = 666.

It is not a de Polignac number, because 161155143 - 2¹⁸ = 160892999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161155147) 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, 95433 + ... + 97106.

It is an arithmetic number, because the mean of its divisors is an integer number (15403200).

Almost surely, 2^161155143 is an apocalyptic number.

161155143 is a deficient number, since it is larger than the sum of its proper divisors (85296057).

161155143 is a wasteful number, since it uses less digits than its factorization.

161155143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192579 (or 192573 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 161155143 is about 12694.6895590243. The cubic root of 161155143 is about 544.1868669861.

The spelling of 161155143 in words is "one hundred sixty-one million, one hundred fifty-five thousand, one hundred forty-three".