231218423 has 2 divisors, whose sum is σ = 231218424. Its totient is φ = 231218422.

The previous prime is 231218389. The next prime is 231218431. The reversal of 231218423 is 324812132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231218423 - 2⁸ = 231218167 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231218392 and 231218401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231218443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115609211 + 115609212.

It is an arithmetic number, because the mean of its divisors is an integer number (115609212).

Almost surely, 2^231218423 is an apocalyptic number.

231218423 is a deficient number, since it is larger than the sum of its proper divisors (1).

231218423 is an equidigital number, since it uses as much as digits as its factorization.

231218423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 231218423 is about 15205.8680449358. The cubic root of 231218423 is about 613.7725738369.

The spelling of 231218423 in words is "two hundred thirty-one million, two hundred eighteen thousand, four hundred twenty-three".