231540019 has 2 divisors, whose sum is σ = 231540020. Its totient is φ = 231540018.

The previous prime is 231539999. The next prime is 231540077. The reversal of 231540019 is 910045132.

231540019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231540019 - 2¹³ = 231531827 is a prime.

It is a super-3 number, since 3×231540019³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 231539975 and 231540002.

It is not a weakly prime, because it can be changed into another prime (231540619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115770009 + 115770010.

It is an arithmetic number, because the mean of its divisors is an integer number (115770010).

Almost surely, 2^231540019 is an apocalyptic number.

231540019 is a deficient number, since it is larger than the sum of its proper divisors (1).

231540019 is an equidigital number, since it uses as much as digits as its factorization.

231540019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 231540019 is about 15216.4391038114. The cubic root of 231540019 is about 614.0570023861.

The spelling of 231540019 in words is "two hundred thirty-one million, five hundred forty thousand, nineteen".