231421523 has 2 divisors, whose sum is σ = 231421524. Its totient is φ = 231421522.

The previous prime is 231421499. The next prime is 231421529. The reversal of 231421523 is 325124132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231421523 - 2¹² = 231417427 is a prime.

It is not a weakly prime, because it can be changed into another prime (231421529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115710761 + 115710762.

It is an arithmetic number, because the mean of its divisors is an integer number (115710762).

Almost surely, 2^231421523 is an apocalyptic number.

231421523 is a deficient number, since it is larger than the sum of its proper divisors (1).

231421523 is an equidigital number, since it uses as much as digits as its factorization.

231421523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 231421523 is about 15212.5449218729. The cubic root of 231421523 is about 613.9522318513.

Adding to 231421523 its reverse (325124132), we get a palindrome (556545655).

The spelling of 231421523 in words is "two hundred thirty-one million, four hundred twenty-one thousand, five hundred twenty-three".