261947312 has 20 divisors (see below), whose sum is σ = 553661736. Its totient is φ = 119066880.

The previous prime is 261947311. The next prime is 261947317. The reversal of 261947312 is 213749162.

It is not an unprimeable number, because it can be changed into a prime (261947311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743993 + ... + 744344.

Almost surely, 2^261947312 is an apocalyptic number.

261947312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261947312 is an abundant number, since it is smaller than the sum of its proper divisors (291714424).

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

261947312 is a wasteful number, since it uses less digits than its factorization.

261947312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488356 (or 1488350 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 261947312 is about 16184.7864366509. The cubic root of 261947312 is about 639.8398948466.

The spelling of 261947312 in words is "two hundred sixty-one million, nine hundred forty-seven thousand, three hundred twelve".