231989819 has 4 divisors (see below), whose sum is σ = 232041696. Its totient is φ = 231937944.

The previous prime is 231989809. The next prime is 231989827. The reversal of 231989819 is 918989132.

It is a happy number.

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 231989819 - 2¹⁶ = 231924283 is a prime.

It is a super-2 number, since 2×231989819² = 107638552239305522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (231989809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18524 + ... + 28409.

It is an arithmetic number, because the mean of its divisors is an integer number (58010424).

Almost surely, 2^231989819 is an apocalyptic number.

231989819 is a deficient number, since it is larger than the sum of its proper divisors (51877).

231989819 is an equidigital number, since it uses as much as digits as its factorization.

231989819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51876.

The product of its digits is 279936, while the sum is 50.

The square root of 231989819 is about 15231.2120003629. The cubic root of 231989819 is about 614.4543767133.

The spelling of 231989819 in words is "two hundred thirty-one million, nine hundred eighty-nine thousand, eight hundred nineteen".