261661192 has 32 divisors (see below), whose sum is σ = 540650880. Its totient is φ = 117956160.

The previous prime is 261661181. The next prime is 261661201. The reversal of 261661192 is 291166162.

It is a super-3 number, since 3×261661192³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24784 + ... + 33727.

It is an arithmetic number, because the mean of its divisors is an integer number (16895340).

Almost surely, 2^261661192 is an apocalyptic number.

It is an amenable number.

261661192 is an abundant number, since it is smaller than the sum of its proper divisors (278989688).

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

261661192 is a wasteful number, since it uses less digits than its factorization.

261661192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58573 (or 58569 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 261661192 is about 16175.9448564837. The cubic root of 261661192 is about 639.6068483804.

The spelling of 261661192 in words is "two hundred sixty-one million, six hundred sixty-one thousand, one hundred ninety-two".