261157712 has 20 divisors (see below), whose sum is σ = 515541780. Its totient is φ = 128114688.

The previous prime is 261157711. The next prime is 261157727. The reversal of 261157712 is 217751162.

261157712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 193655056 + 67502656 = 13916^2 + 8216^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261157711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153137 + ... + 154832.

It is an arithmetic number, because the mean of its divisors is an integer number (25777089).

Almost surely, 2^261157712 is an apocalyptic number.

It is an amenable number.

261157712 is a deficient number, since it is larger than the sum of its proper divisors (254384068).

261157712 is a wasteful number, since it uses less digits than its factorization.

261157712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308030 (or 308024 counting only the distinct ones).

The product of its digits is 5880, while the sum is 32.

The square root of 261157712 is about 16160.3747481301. The cubic root of 261157712 is about 639.1963480425.

The spelling of 261157712 in words is "two hundred sixty-one million, one hundred fifty-seven thousand, seven hundred twelve".