261946256 has 40 divisors (see below), whose sum is σ = 596253504. Its totient is φ = 109906560.

The previous prime is 261946247. The next prime is 261946259. The reversal of 261946256 is 652649162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261946259) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54956 + ... + 59531.

Almost surely, 2^261946256 is an apocalyptic number.

261946256 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

261946256 is an abundant number, since it is smaller than the sum of its proper divisors (334307248).

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

261946256 is a wasteful number, since it uses less digits than its factorization.

261946256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114519 (or 114513 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 261946256 is about 16184.7538133887. The cubic root of 261946256 is about 639.8390350403.

The spelling of 261946256 in words is "two hundred sixty-one million, nine hundred forty-six thousand, two hundred fifty-six".