261693256 has 16 divisors (see below), whose sum is σ = 535281840. Its totient is φ = 118951440.

The previous prime is 261693253. The next prime is 261693259. The reversal of 261693256 is 652396162.

261693256 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261693253) and next prime (261693259).

It is not an unprimeable number, because it can be changed into a prime (261693253) 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, 1486806 + ... + 1486981.

It is an arithmetic number, because the mean of its divisors is an integer number (33455115).

Almost surely, 2^261693256 is an apocalyptic number.

It is an amenable number.

261693256 is an abundant number, since it is smaller than the sum of its proper divisors (273588584).

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

261693256 is a wasteful number, since it uses less digits than its factorization.

261693256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973804 (or 2973800 counting only the distinct ones).

The product of its digits is 116640, while the sum is 40.

The square root of 261693256 is about 16176.9359274246. The cubic root of 261693256 is about 639.6329731516.

The spelling of 261693256 in words is "two hundred sixty-one million, six hundred ninety-three thousand, two hundred fifty-six".