261210612 has 48 divisors (see below), whose sum is σ = 657390272. Its totient is φ = 80248320.

The previous prime is 261210611. The next prime is 261210617. The reversal of 261210612 is 216012162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261210611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200748 + ... + 202044.

Almost surely, 2^261210612 is an apocalyptic number.

It is an amenable number.

261210612 is an abundant number, since it is smaller than the sum of its proper divisors (396179660).

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

261210612 is a wasteful number, since it uses less digits than its factorization.

261210612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2608 (or 2606 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 261210612 is about 16162.0113847256. The cubic root of 261210612 is about 639.2395035796.

Adding to 261210612 its reverse (216012162), we get a palindrome (477222774).

The spelling of 261210612 in words is "two hundred sixty-one million, two hundred ten thousand, six hundred twelve".