181323421 has 16 divisors (see below), whose sum is σ = 197123328. Its totient is φ = 166320000.

The previous prime is 181323397. The next prime is 181323449. The reversal of 181323421 is 124323181.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 181323421 - 2¹³ = 181315229 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 (181323451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58921 + ... + 61921.

It is an arithmetic number, because the mean of its divisors is an integer number (12320208).

Almost surely, 2^181323421 is an apocalyptic number.

It is an amenable number.

181323421 is a deficient number, since it is larger than the sum of its proper divisors (15799907).

181323421 is a wasteful number, since it uses less digits than its factorization.

181323421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132.

The product of its digits is 1152, while the sum is 25.

The square root of 181323421 is about 13465.6385292343. The cubic root of 181323421 is about 566.0020029729.

The spelling of 181323421 in words is "one hundred eighty-one million, three hundred twenty-three thousand, four hundred twenty-one".