161405143 has 2 divisors, whose sum is σ = 161405144. Its totient is φ = 161405142.

The previous prime is 161405093. The next prime is 161405147. The reversal of 161405143 is 341504161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161405143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161405147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80702571 + 80702572.

It is an arithmetic number, because the mean of its divisors is an integer number (80702572).

Almost surely, 2^161405143 is an apocalyptic number.

161405143 is a deficient number, since it is larger than the sum of its proper divisors (1).

161405143 is an equidigital number, since it uses as much as digits as its factorization.

161405143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 161405143 is about 12704.5323802177. The cubic root of 161405143 is about 544.4681206589.

The spelling of 161405143 in words is "one hundred sixty-one million, four hundred five thousand, one hundred forty-three".