231111019 has 2 divisors, whose sum is σ = 231111020. Its totient is φ = 231111018.

The previous prime is 231110989. The next prime is 231111029. The reversal of 231111019 is 910111132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231111019 - 2²¹ = 229013867 is a prime.

It is a super-2 number, since 2×231111019² = 106824606206436722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231110987 and 231111005.

It is not a weakly prime, because it can be changed into another prime (231111029) 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 as a sum of consecutive naturals, namely, 115555509 + 115555510.

It is an arithmetic number, because the mean of its divisors is an integer number (115555510).

Almost surely, 2^231111019 is an apocalyptic number.

231111019 is a deficient number, since it is larger than the sum of its proper divisors (1).

231111019 is an equidigital number, since it uses as much as digits as its factorization.

231111019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 231111019 is about 15202.3359718170. The cubic root of 231111019 is about 613.6775239724.

The spelling of 231111019 in words is "two hundred thirty-one million, one hundred eleven thousand, nineteen".