161857183 has 2 divisors, whose sum is σ = 161857184. Its totient is φ = 161857182.

The previous prime is 161857159. The next prime is 161857229. The reversal of 161857183 is 381758161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161857183 - 2⁹ = 161856671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161857103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80928591 + 80928592.

It is an arithmetic number, because the mean of its divisors is an integer number (80928592).

Almost surely, 2^161857183 is an apocalyptic number.

161857183 is a deficient number, since it is larger than the sum of its proper divisors (1).

161857183 is an equidigital number, since it uses as much as digits as its factorization.

161857183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 40.

The square root of 161857183 is about 12722.3104426830. The cubic root of 161857183 is about 544.9759358676.

The spelling of 161857183 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, one hundred eighty-three".