260531721 has 12 divisors (see below), whose sum is σ = 390261872. Its totient is φ = 173687652.

The previous prime is 260531707. The next prime is 260531827. The reversal of 260531721 is 127135062.

It is a happy number.

260531721 is a `hidden beast` number, since 2 + 60 + 531 + 72 + 1 = 666.

260531721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-260531721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (260531701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 535831 + ... + 536316.

Almost surely, 2^260531721 is an apocalyptic number.

It is an amenable number.

260531721 is a deficient number, since it is larger than the sum of its proper divisors (129730151).

260531721 is an equidigital number, since it uses as much as digits as its factorization.

260531721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072162 (or 1072150 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 260531721 is about 16140.9950436768. The cubic root of 260531721 is about 638.6852248503.

Adding to 260531721 its reverse (127135062), we get a palindrome (387666783).

The spelling of 260531721 in words is "two hundred sixty million, five hundred thirty-one thousand, seven hundred twenty-one".