261252321 has 8 divisors (see below), whose sum is σ = 380003424. Its totient is φ = 158334720.

The previous prime is 261252319. The next prime is 261252347. The reversal of 261252321 is 123252162.

261252321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 261252321 - 2¹ = 261252319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261252291 and 261252300.

It is not an unprimeable number, because it can be changed into a prime (261252371) 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, 3958336 + ... + 3958401.

It is an arithmetic number, because the mean of its divisors is an integer number (47500428).

Almost surely, 2^261252321 is an apocalyptic number.

It is an amenable number.

261252321 is a deficient number, since it is larger than the sum of its proper divisors (118751103).

261252321 is a wasteful number, since it uses less digits than its factorization.

261252321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7916751.

The product of its digits is 1440, while the sum is 24.

The square root of 261252321 is about 16163.3016738536. The cubic root of 261252321 is about 639.2735254509.

The spelling of 261252321 in words is "two hundred sixty-one million, two hundred fifty-two thousand, three hundred twenty-one".