261475847 has 4 divisors (see below), whose sum is σ = 261646200. Its totient is φ = 261305496.

The previous prime is 261475843. The next prime is 261475867. The reversal of 261475847 is 748574162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261475847 - 2² = 261475843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261475798 and 261475807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261475843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82853 + ... + 85950.

It is an arithmetic number, because the mean of its divisors is an integer number (65411550).

Almost surely, 2^261475847 is an apocalyptic number.

261475847 is a deficient number, since it is larger than the sum of its proper divisors (170353).

261475847 is a wasteful number, since it uses less digits than its factorization.

261475847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170352.

The product of its digits is 376320, while the sum is 44.

The square root of 261475847 is about 16170.2148099523. The cubic root of 261475847 is about 639.4557930759.

The spelling of 261475847 in words is "two hundred sixty-one million, four hundred seventy-five thousand, eight hundred forty-seven".