261641324 has 48 divisors (see below), whose sum is σ = 554641920. Its totient is φ = 105494400.

The previous prime is 261641323. The next prime is 261641327. The reversal of 261641324 is 423146162.

261641324 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261641323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78704 + ... + 81960.

It is an arithmetic number, because the mean of its divisors is an integer number (11555040).

Almost surely, 2^261641324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261641324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277320960).

261641324 is an abundant number, since it is smaller than the sum of its proper divisors (293000596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261641324 is a wasteful number, since it uses less digits than its factorization.

261641324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438 (or 3436 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 261641324 is about 16175.3307230486. The cubic root of 261641324 is about 639.5906594678.

Adding to 261641324 its reverse (423146162), we get a palindrome (684787486).

The spelling of 261641324 in words is "two hundred sixty-one million, six hundred forty-one thousand, three hundred twenty-four".