231819919 has 2 divisors, whose sum is σ = 231819920. Its totient is φ = 231819918.

The previous prime is 231819869. The next prime is 231819949. The reversal of 231819919 is 919918132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231819919 - 2¹¹ = 231817871 is a prime.

It is a super-2 number, since 2×231819919² = 107480949690333122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231819949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115909959 + 115909960.

It is an arithmetic number, because the mean of its divisors is an integer number (115909960).

Almost surely, 2^231819919 is an apocalyptic number.

231819919 is a deficient number, since it is larger than the sum of its proper divisors (1).

231819919 is an equidigital number, since it uses as much as digits as its factorization.

231819919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 43.

The square root of 231819919 is about 15225.6336157153. The cubic root of 231819919 is about 614.3043395342.

The spelling of 231819919 in words is "two hundred thirty-one million, eight hundred nineteen thousand, nine hundred nineteen".