261321652 has 12 divisors (see below), whose sum is σ = 457863840. Its totient is φ = 130503416.

The previous prime is 261321647. The next prime is 261321667. The reversal of 261321652 is 256123162.

261321652 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261321652.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 35578 + ... + 42289.

It is an arithmetic number, because the mean of its divisors is an integer number (38155320).

Almost surely, 2^261321652 is an apocalyptic number.

It is an amenable number.

261321652 is a deficient number, since it is larger than the sum of its proper divisors (196542188).

261321652 is a wasteful number, since it uses less digits than its factorization.

261321652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78710 (or 78708 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 261321652 is about 16165.4462357214. The cubic root of 261321652 is about 639.3300704703.

The spelling of 261321652 in words is "two hundred sixty-one million, three hundred twenty-one thousand, six hundred fifty-two".