161235023 has 4 divisors (see below), whose sum is σ = 163967880. Its totient is φ = 158502168.

The previous prime is 161234977. The next prime is 161235029. The reversal of 161235023 is 320532161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161235023 - 2⁶ = 161234959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161235023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161235029) 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, 1366340 + ... + 1366457.

It is an arithmetic number, because the mean of its divisors is an integer number (40991970).

Almost surely, 2^161235023 is an apocalyptic number.

161235023 is a deficient number, since it is larger than the sum of its proper divisors (2732857).

161235023 is an equidigital number, since it uses as much as digits as its factorization.

161235023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732856.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 161235023 is about 12697.8353667072. The cubic root of 161235023 is about 544.2767647618.

Adding to 161235023 its reverse (320532161), we get a palindrome (481767184).

The spelling of 161235023 in words is "one hundred sixty-one million, two hundred thirty-five thousand, twenty-three".