261651882 has 8 divisors (see below), whose sum is σ = 523303776. Its totient is φ = 87217292.

The previous prime is 261651853. The next prime is 261651883. The reversal of 261651882 is 288156162.

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

261651882 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 261651882.

It is not an unprimeable number, because it can be changed into a prime (261651883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21804318 + ... + 21804329.

It is an arithmetic number, because the mean of its divisors is an integer number (65412972).

Almost surely, 2^261651882 is an apocalyptic number.

261651882 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261651882 is a wasteful number, since it uses less digits than its factorization.

261651882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43608652.

The product of its digits is 46080, while the sum is 39.

The square root of 261651882 is about 16175.6570809349. The cubic root of 261651882 is about 639.5992624760.

The spelling of 261651882 in words is "two hundred sixty-one million, six hundred fifty-one thousand, eight hundred eighty-two".