261333867 has 4 divisors (see below), whose sum is σ = 348445160. Its totient is φ = 174222576.

The previous prime is 261333859. The next prime is 261333881. The reversal of 261333867 is 768333162.

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

It is not a de Polignac number, because 261333867 - 2³ = 261333859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261333887) 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 3 ways as a sum of consecutive naturals, for example, 43555642 + ... + 43555647.

It is an arithmetic number, because the mean of its divisors is an integer number (87111290).

Almost surely, 2^261333867 is an apocalyptic number.

261333867 is a deficient number, since it is larger than the sum of its proper divisors (87111293).

261333867 is an equidigital number, since it uses as much as digits as its factorization.

261333867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87111292.

The product of its digits is 108864, while the sum is 39.

The square root of 261333867 is about 16165.8240433329. The cubic root of 261333867 is about 639.3400317512.

The spelling of 261333867 in words is "two hundred sixty-one million, three hundred thirty-three thousand, eight hundred sixty-seven".