261985092 has 48 divisors (see below), whose sum is σ = 634368000. Its totient is φ = 84062880.

The previous prime is 261985081. The next prime is 261985109. The reversal of 261985092 is 290589162.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72259 + ... + 75797.

It is an arithmetic number, because the mean of its divisors is an integer number (13216000).

Almost surely, 2^261985092 is an apocalyptic number.

It is an amenable number.

261985092 is an abundant number, since it is smaller than the sum of its proper divisors (372382908).

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

261985092 is a wasteful number, since it uses less digits than its factorization.

261985092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3776 (or 3774 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 261985092 is about 16185.9535400297. The cubic root of 261985092 is about 639.8706541992.

The spelling of 261985092 in words is "two hundred sixty-one million, nine hundred eighty-five thousand, ninety-two".