261191874 has 24 divisors (see below), whose sum is σ = 531133200. Its totient is φ = 85629360.

The previous prime is 261191873. The next prime is 261191881. The reversal of 261191874 is 478191162.

261191874 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261191873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16477 + ... + 28175.

It is an arithmetic number, because the mean of its divisors is an integer number (22130550).

Almost surely, 2^261191874 is an apocalyptic number.

261191874 is an abundant number, since it is smaller than the sum of its proper divisors (269941326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261191874 is a wasteful number, since it uses less digits than its factorization.

261191874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11826 (or 11765 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 261191874 is about 16161.4316816302. The cubic root of 261191874 is about 639.2242178859.

The spelling of 261191874 in words is "two hundred sixty-one million, one hundred ninety-one thousand, eight hundred seventy-four".