161157 has 4 divisors (see below), whose sum is σ = 214880. Its totient is φ = 107436.

The previous prime is 161149. The next prime is 161159. The reversal of 161157 is 751161.

161157 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161157 - 2³ = 161149 is a prime.

It is a D-number.

It is a Duffinian number.

161157 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26857 + ... + 26862.

It is an arithmetic number, because the mean of its divisors is an integer number (53720).

2¹⁶¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

161157 is a deficient number, since it is larger than the sum of its proper divisors (53723).

161157 is an equidigital number, since it uses as much as digits as its factorization.

161157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53722.

The product of its digits is 210, while the sum is 21.

The square root of 161157 is about 401.4436448619. The cubic root of 161157 is about 54.4188957210.

The spelling of 161157 in words is "one hundred sixty-one thousand, one hundred fifty-seven".