231548609 has 2 divisors, whose sum is σ = 231548610. Its totient is φ = 231548608.

The previous prime is 231548561. The next prime is 231548651. The reversal of 231548609 is 906845132.

It is a happy number.

231548609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189337600 + 42211009 = 13760^2 + 6497^2 .

It is a cyclic number.

It is not a de Polignac number, because 231548609 - 2⁸ = 231548353 is a prime.

It is a super-2 number, since 2×231548609² = 107229516659669762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231548699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115774304 + 115774305.

It is an arithmetic number, because the mean of its divisors is an integer number (115774305).

Almost surely, 2^231548609 is an apocalyptic number.

It is an amenable number.

231548609 is a deficient number, since it is larger than the sum of its proper divisors (1).

231548609 is an equidigital number, since it uses as much as digits as its factorization.

231548609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 231548609 is about 15216.7213617126. The cubic root of 231548609 is about 614.0645960114.

The spelling of 231548609 in words is "two hundred thirty-one million, five hundred forty-eight thousand, six hundred nine".