231847919 has 2 divisors, whose sum is σ = 231847920. Its totient is φ = 231847918.

The previous prime is 231847897. The next prime is 231847933. The reversal of 231847919 is 919748132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231847919 is a prime.

It is a super-2 number, since 2×231847919² = 107506915089261122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231847919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231847219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115923959 + 115923960.

It is an arithmetic number, because the mean of its divisors is an integer number (115923960).

Almost surely, 2^231847919 is an apocalyptic number.

231847919 is a deficient number, since it is larger than the sum of its proper divisors (1).

231847919 is an equidigital number, since it uses as much as digits as its factorization.

231847919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 231847919 is about 15226.5530899150. The cubic root of 231847919 is about 614.3290711292.

The spelling of 231847919 in words is "two hundred thirty-one million, eight hundred forty-seven thousand, nine hundred nineteen".