181421379 has 12 divisors (see below), whose sum is σ = 262330432. Its totient is φ = 120819600.

The previous prime is 181421377. The next prime is 181421407. The reversal of 181421379 is 973124181.

It is a happy number.

It is not a de Polignac number, because 181421379 - 2¹ = 181421377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181421377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1252 + ... + 19089.

Almost surely, 2^181421379 is an apocalyptic number.

181421379 is a deficient number, since it is larger than the sum of its proper divisors (80909053).

181421379 is a wasteful number, since it uses less digits than its factorization.

181421379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21338 (or 21335 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 181421379 is about 13469.2753702640. The cubic root of 181421379 is about 566.1039100928.

The spelling of 181421379 in words is "one hundred eighty-one million, four hundred twenty-one thousand, three hundred seventy-nine".