161223413 has 8 divisors (see below), whose sum is σ = 173724600. Its totient is φ = 148736448.

The previous prime is 161223401. The next prime is 161223431. The reversal of 161223413 is 314322161.

161223413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9604 + 161213809 = 98^2 + 12697^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 161223413 - 2¹⁰ = 161222389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161223443) 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, 38423 + ... + 42411.

It is an arithmetic number, because the mean of its divisors is an integer number (21715575).

Almost surely, 2^161223413 is an apocalyptic number.

161223413 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161223413 is a deficient number, since it is larger than the sum of its proper divisors (12501187).

161223413 is a wasteful number, since it uses less digits than its factorization.

161223413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7111.

The product of its digits is 864, while the sum is 23.

The square root of 161223413 is about 12697.3781939422. The cubic root of 161223413 is about 544.2637005925.

Adding to 161223413 its reverse (314322161), we get a palindrome (475545574).

The spelling of 161223413 in words is "one hundred sixty-one million, two hundred twenty-three thousand, four hundred thirteen".