261252851 has 8 divisors (see below), whose sum is σ = 270890400. Its totient is φ = 251657280.

The previous prime is 261252809. The next prime is 261252853. The reversal of 261252851 is 158252162.

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

It is a cyclic number.

It is not a de Polignac number, because 261252851 - 2²⁶ = 194143987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261252853) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2471 + ... + 22991.

It is an arithmetic number, because the mean of its divisors is an integer number (33861300).

Almost surely, 2^261252851 is an apocalyptic number.

261252851 is a deficient number, since it is larger than the sum of its proper divisors (9637549).

261252851 is a wasteful number, since it uses less digits than its factorization.

261252851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20989.

The product of its digits is 9600, while the sum is 32.

The square root of 261252851 is about 16163.3180690105. The cubic root of 261252851 is about 639.2739577466.

The spelling of 261252851 in words is "two hundred sixty-one million, two hundred fifty-two thousand, eight hundred fifty-one".