231447613 has 2 divisors, whose sum is σ = 231447614. Its totient is φ = 231447612.

The previous prime is 231447589. The next prime is 231447631. The reversal of 231447613 is 316744132.

231447613 = 10757² + 10758².

Together with next prime (231447631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115734564 + 115713049 = 10758^2 + 10757^2 .

It is a cyclic number.

It is not a de Polignac number, because 231447613 - 2²¹ = 229350461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231477613) 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, 115723806 + 115723807.

It is an arithmetic number, because the mean of its divisors is an integer number (115723807).

Almost surely, 2^231447613 is an apocalyptic number.

231447613 is the 10758-th centered square number.

It is an amenable number.

231447613 is a deficient number, since it is larger than the sum of its proper divisors (1).

231447613 is an equidigital number, since it uses as much as digits as its factorization.

231447613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 231447613 is about 15213.4024136614. The cubic root of 231447613 is about 613.9753029002.

The spelling of 231447613 in words is "two hundred thirty-one million, four hundred forty-seven thousand, six hundred thirteen".