161530143 has 4 divisors (see below), whose sum is σ = 215373528. Its totient is φ = 107686760.

The previous prime is 161530133. The next prime is 161530147. The reversal of 161530143 is 341035161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161530143 - 2⁵ = 161530111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161530147) 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, 26921688 + ... + 26921693.

It is an arithmetic number, because the mean of its divisors is an integer number (53843382).

Almost surely, 2^161530143 is an apocalyptic number.

161530143 is a deficient number, since it is larger than the sum of its proper divisors (53843385).

161530143 is an equidigital number, since it uses as much as digits as its factorization.

161530143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53843384.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 161530143 is about 12709.4509322787. The cubic root of 161530143 is about 544.6086385963.

The spelling of 161530143 in words is "one hundred sixty-one million, five hundred thirty thousand, one hundred forty-three".