161453823 has 4 divisors (see below), whose sum is σ = 215271768. Its totient is φ = 107635880.

The previous prime is 161453791. The next prime is 161453827. The reversal of 161453823 is 328354161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328354161 = 3 ⋅109451387.

It is a cyclic number.

It is not a de Polignac number, because 161453823 - 2⁵ = 161453791 is a prime.

It is a super-2 number, since 2×161453823² = 52134673922630658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161453827) 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, 26908968 + ... + 26908973.

It is an arithmetic number, because the mean of its divisors is an integer number (53817942).

Almost surely, 2^161453823 is an apocalyptic number.

161453823 is a deficient number, since it is larger than the sum of its proper divisors (53817945).

161453823 is an equidigital number, since it uses as much as digits as its factorization.

161453823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53817944.

The product of its digits is 17280, while the sum is 33.

The square root of 161453823 is about 12706.4480874869. The cubic root of 161453823 is about 544.5228525868.

The spelling of 161453823 in words is "one hundred sixty-one million, four hundred fifty-three thousand, eight hundred twenty-three".