261272407 has 8 divisors (see below), whose sum is σ = 285299712. Its totient is φ = 237291000.

The previous prime is 261272383. The next prime is 261272411. The reversal of 261272407 is 704272162.

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 261272407 - 2¹⁹ = 260748119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261272447) 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, 1032 + ... + 22882.

It is an arithmetic number, because the mean of its divisors is an integer number (35662464).

Almost surely, 2^261272407 is an apocalyptic number.

261272407 is a deficient number, since it is larger than the sum of its proper divisors (24027305).

261272407 is a wasteful number, since it uses less digits than its factorization.

261272407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22949.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 261272407 is about 16163.9230077355. The cubic root of 261272407 is about 639.2899082323.

The spelling of 261272407 in words is "two hundred sixty-one million, two hundred seventy-two thousand, four hundred seven".