261949286 has 8 divisors (see below), whose sum is σ = 406473120. Its totient is φ = 126458248.

The previous prime is 261949183. The next prime is 261949309. The reversal of 261949286 is 682949162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 261949286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2258126 + ... + 2258241.

It is an arithmetic number, because the mean of its divisors is an integer number (50809140).

Almost surely, 2^261949286 is an apocalyptic number.

261949286 is a deficient number, since it is larger than the sum of its proper divisors (144523834).

261949286 is a wasteful number, since it uses less digits than its factorization.

261949286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4516398.

The product of its digits is 373248, while the sum is 47.

The square root of 261949286 is about 16184.8474197318. The cubic root of 261949286 is about 639.8415020919.

The spelling of 261949286 in words is "two hundred sixty-one million, nine hundred forty-nine thousand, two hundred eighty-six".