261883899 has 12 divisors (see below), whose sum is σ = 378651000. Its totient is φ = 174416544.

The previous prime is 261883883. The next prime is 261883901. The reversal of 261883899 is 998388162.

It is a happy number.

It is not a de Polignac number, because 261883899 - 2⁴ = 261883883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261881899) 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, 4429 + ... + 23310.

It is an arithmetic number, because the mean of its divisors is an integer number (31554250).

Almost surely, 2^261883899 is an apocalyptic number.

261883899 is a deficient number, since it is larger than the sum of its proper divisors (116767101).

261883899 is a wasteful number, since it uses less digits than its factorization.

261883899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28794 (or 28791 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 261883899 is about 16182.8272869731. The cubic root of 261883899 is about 639.7882592187.

The spelling of 261883899 in words is "two hundred sixty-one million, eight hundred eighty-three thousand, eight hundred ninety-nine".