231344521 has 2 divisors, whose sum is σ = 231344522. Its totient is φ = 231344520.

The previous prime is 231344507. The next prime is 231344527. The reversal of 231344521 is 125443132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149695225 + 81649296 = 12235^2 + 9036^2 .

It is a cyclic number.

It is not a de Polignac number, because 231344521 - 2²³ = 222955913 is a prime.

It is not a weakly prime, because it can be changed into another prime (231344527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115672260 + 115672261.

It is an arithmetic number, because the mean of its divisors is an integer number (115672261).

Almost surely, 2^231344521 is an apocalyptic number.

It is an amenable number.

231344521 is a deficient number, since it is larger than the sum of its proper divisors (1).

231344521 is an equidigital number, since it uses as much as digits as its factorization.

231344521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 231344521 is about 15210.0138395729. The cubic root of 231344521 is about 613.8841298679.

Adding to 231344521 its reverse (125443132), we get a palindrome (356787653).

The spelling of 231344521 in words is "two hundred thirty-one million, three hundred forty-four thousand, five hundred twenty-one".