161532243 has 48 divisors (see below), whose sum is σ = 260532480. Its totient is φ = 95971392.

The previous prime is 161532199. The next prime is 161532247. The reversal of 161532243 is 342235161.

161532243 is a `hidden beast` number, since 1 + 615 + 3 + 2 + 2 + 43 = 666.

It is not a de Polignac number, because 161532243 - 2¹⁶ = 161466707 is a prime.

It is a super-2 number, since 2×161532243² = 52185331057222098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161532247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 263205 + ... + 263817.

It is an arithmetic number, because the mean of its divisors is an integer number (5427760).

Almost surely, 2^161532243 is an apocalyptic number.

161532243 is a deficient number, since it is larger than the sum of its proper divisors (99000237).

161532243 is a wasteful number, since it uses less digits than its factorization.

161532243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 725 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 161532243 is about 12709.5335476956. The cubic root of 161532243 is about 544.6109986784.

The spelling of 161532243 in words is "one hundred sixty-one million, five hundred thirty-two thousand, two hundred forty-three".