161957 has 2 divisors, whose sum is σ = 161958. Its totient is φ = 161956.

The previous prime is 161947. The next prime is 161969. The reversal of 161957 is 759161.

It is a happy number.

161957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160801 + 1156 = 401^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 161957 - 2¹⁰ = 160933 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161957.

It is not a weakly prime, because it can be changed into another prime (161947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80978 + 80979.

It is an arithmetic number, because the mean of its divisors is an integer number (80979).

2¹⁶¹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

161957 is a deficient number, since it is larger than the sum of its proper divisors (1).

161957 is an equidigital number, since it uses as much as digits as its factorization.

161957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 29.

The square root of 161957 is about 402.4388152254. The cubic root of 161957 is about 54.5087941368.

The spelling of 161957 in words is "one hundred sixty-one thousand, nine hundred fifty-seven".