161431543 has 32 divisors (see below), whose sum is σ = 212172800. Its totient is φ = 119252736.

The previous prime is 161431519. The next prime is 161431561. The reversal of 161431543 is 345134161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161431543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161431583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125578 + ... + 126856.

It is an arithmetic number, because the mean of its divisors is an integer number (6630400).

Almost surely, 2^161431543 is an apocalyptic number.

161431543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161431543 is a deficient number, since it is larger than the sum of its proper divisors (50741257).

161431543 is a wasteful number, since it uses less digits than its factorization.

161431543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391.

The product of its digits is 4320, while the sum is 28.

The square root of 161431543 is about 12705.5713370159. The cubic root of 161431543 is about 544.4978040888.

The spelling of 161431543 in words is "one hundred sixty-one million, four hundred thirty-one thousand, five hundred forty-three".