161913 has 8 divisors (see below), whose sum is σ = 222976. Its totient is φ = 104400.

The previous prime is 161911. The next prime is 161921. The reversal of 161913 is 319161.

It is a happy number.

161913 is nontrivially palindromic in base 2.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161913 - 2¹ = 161911 is a prime.

It is a Duffinian number.

161913 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 161913.

It is not an unprimeable number, because it can be changed into a prime (161911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 778 + ... + 963.

It is an arithmetic number, because the mean of its divisors is an integer number (27872).

2¹⁶¹⁹¹³ is an apocalyptic number.

It is an amenable number.

161913 is a deficient number, since it is larger than the sum of its proper divisors (61063).

161913 is a wasteful number, since it uses less digits than its factorization.

161913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775.

The product of its digits is 162, while the sum is 21.

The square root of 161913 is about 402.3841448169. The cubic root of 161913 is about 54.5038574269.

The spelling of 161913 in words is "one hundred sixty-one thousand, nine hundred thirteen".