261647267 has 8 divisors (see below), whose sum is σ = 301986912. Its totient is φ = 222048000.

The previous prime is 261647227. The next prime is 261647293. The reversal of 261647267 is 762746162.

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 261647267 - 2¹⁰ = 261646243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261647227) 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, 184334 + ... + 185747.

It is an arithmetic number, because the mean of its divisors is an integer number (37748364).

Almost surely, 2^261647267 is an apocalyptic number.

261647267 is a deficient number, since it is larger than the sum of its proper divisors (40339645).

261647267 is a wasteful number, since it uses less digits than its factorization.

261647267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370189.

The product of its digits is 169344, while the sum is 41.

The square root of 261647267 is about 16175.5144276774. The cubic root of 261647267 is about 639.5955020495.

The spelling of 261647267 in words is "two hundred sixty-one million, six hundred forty-seven thousand, two hundred sixty-seven".