161597143 has 2 divisors, whose sum is σ = 161597144. Its totient is φ = 161597142.

The previous prime is 161597131. The next prime is 161597197. The reversal of 161597143 is 341795161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161597143 is a prime.

It is a super-2 number, since 2×161597143² = 52227273251524898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161597123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80798571 + 80798572.

It is an arithmetic number, because the mean of its divisors is an integer number (80798572).

Almost surely, 2^161597143 is an apocalyptic number.

161597143 is a deficient number, since it is larger than the sum of its proper divisors (1).

161597143 is an equidigital number, since it uses as much as digits as its factorization.

161597143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 161597143 is about 12712.0864927832. The cubic root of 161597143 is about 544.6839263709.

The spelling of 161597143 in words is "one hundred sixty-one million, five hundred ninety-seven thousand, one hundred forty-three".