261849116 has 24 divisors (see below), whose sum is σ = 464108400. Its totient is φ = 129255552.

The previous prime is 261849109. The next prime is 261849163. The reversal of 261849116 is 611948162.

It is a self number, because there is not a number n which added to its sum of digits gives 261849116.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148496 + ... + 150248.

It is an arithmetic number, because the mean of its divisors is an integer number (19337850).

Almost surely, 2^261849116 is an apocalyptic number.

It is an amenable number.

261849116 is a deficient number, since it is larger than the sum of its proper divisors (202259284).

261849116 is a wasteful number, since it uses less digits than its factorization.

261849116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213 (or 2211 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 261849116 is about 16181.7525626862. The cubic root of 261849116 is about 639.7599327473.

The spelling of 261849116 in words is "two hundred sixty-one million, eight hundred forty-nine thousand, one hundred sixteen".