261716212 has 12 divisors (see below), whose sum is σ = 465766560. Its totient is φ = 128640056.

The previous prime is 261716209. The next prime is 261716239. The reversal of 261716212 is 212617162.

It is a congruent number.

It is an unprimeable number.

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, 554248 + ... + 554719.

It is an arithmetic number, because the mean of its divisors is an integer number (38813880).

Almost surely, 2^261716212 is an apocalyptic number.

It is an amenable number.

261716212 is a deficient number, since it is larger than the sum of its proper divisors (204050348).

261716212 is a wasteful number, since it uses less digits than its factorization.

261716212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109030 (or 1109028 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 261716212 is about 16177.6454405454. The cubic root of 261716212 is about 639.6516756909.

The spelling of 261716212 in words is "two hundred sixty-one million, seven hundred sixteen thousand, two hundred twelve".