231645493 has 8 divisors (see below), whose sum is σ = 239427512. Its totient is φ = 223943616.

The previous prime is 231645481. The next prime is 231645499. The reversal of 231645493 is 394546132.

It is the 6214-th star number.

It can be written as a sum of positive squares in 4 ways, for example, as 22496049 + 209149444 = 4743^2 + 14462^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231645493 - 2⁵ = 231645461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231645499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14130 + ... + 25747.

It is an arithmetic number, because the mean of its divisors is an integer number (29928439).

Almost surely, 2^231645493 is an apocalyptic number.

It is an amenable number.

231645493 is a deficient number, since it is larger than the sum of its proper divisors (7782019).

231645493 is a wasteful number, since it uses less digits than its factorization.

231645493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40071.

The product of its digits is 77760, while the sum is 37.

The square root of 231645493 is about 15219.9045003574. The cubic root of 231645493 is about 614.1502292021.

The spelling of 231645493 in words is "two hundred thirty-one million, six hundred forty-five thousand, four hundred ninety-three".