161211423 has 8 divisors (see below), whose sum is σ = 218592000. Its totient is φ = 105652568.

The previous prime is 161211419. The next prime is 161211433. The reversal of 161211423 is 324112161.

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 161211423 - 2² = 161211419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161211423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161211433) 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, 455223 + ... + 455576.

It is an arithmetic number, because the mean of its divisors is an integer number (27324000).

Almost surely, 2^161211423 is an apocalyptic number.

161211423 is a deficient number, since it is larger than the sum of its proper divisors (57380577).

161211423 is an equidigital number, since it uses as much as digits as its factorization.

161211423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910861.

The product of its digits is 288, while the sum is 21.

The square root of 161211423 is about 12696.9060404494. The cubic root of 161211423 is about 544.2502081693.

Adding to 161211423 its reverse (324112161), we get a palindrome (485323584).

The spelling of 161211423 in words is "one hundred sixty-one million, two hundred eleven thousand, four hundred twenty-three".