261369867 has 32 divisors (see below), whose sum is σ = 397393920. Its totient is φ = 151391520.

The previous prime is 261369859. The next prime is 261369869. The reversal of 261369867 is 768963162.

It is not a de Polignac number, because 261369867 - 2³ = 261369859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261369869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64734 + ... + 68652.

It is an arithmetic number, because the mean of its divisors is an integer number (12418560).

Almost surely, 2^261369867 is an apocalyptic number.

261369867 is a deficient number, since it is larger than the sum of its proper divisors (136024053).

261369867 is a wasteful number, since it uses less digits than its factorization.

261369867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023.

The product of its digits is 653184, while the sum is 48.

The square root of 261369867 is about 16166.9374650860. The cubic root of 261369867 is about 639.3693877938.

The spelling of 261369867 in words is "two hundred sixty-one million, three hundred sixty-nine thousand, eight hundred sixty-seven".