161953 has 4 divisors (see below), whose sum is σ = 176688. Its totient is φ = 147220.

The previous prime is 161947. The next prime is 161957. The reversal of 161953 is 359161.

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 a cyclic number.

It is not a de Polignac number, because 161953 - 2⁵ = 161921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161957) 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, 7351 + ... + 7372.

It is an arithmetic number, because the mean of its divisors is an integer number (44172).

2¹⁶¹⁹⁵³ is an apocalyptic number.

It is an amenable number.

161953 is a deficient number, since it is larger than the sum of its proper divisors (14735).

161953 is a wasteful number, since it uses less digits than its factorization.

161953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14734.

The product of its digits is 810, while the sum is 25.

The square root of 161953 is about 402.4338454951. The cubic root of 161953 is about 54.5083453820.

The spelling of 161953 in words is "one hundred sixty-one thousand, nine hundred fifty-three".