261643324 has 6 divisors (see below), whose sum is σ = 457875824. Its totient is φ = 130821660.

The previous prime is 261643321. The next prime is 261643363. The reversal of 261643324 is 423346162.

261643324 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261643321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32705412 + ... + 32705419.

Almost surely, 2^261643324 is an apocalyptic number.

It is an amenable number.

261643324 is a deficient number, since it is larger than the sum of its proper divisors (196232500).

261643324 is a wasteful number, since it uses less digits than its factorization.

261643324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65410835 (or 65410833 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 261643324 is about 16175.3925454686. The cubic root of 261643324 is about 639.5922891518.

Adding to 261643324 its reverse (423346162), we get a palindrome (684989486).

The spelling of 261643324 in words is "two hundred sixty-one million, six hundred forty-three thousand, three hundred twenty-four".