261316456 has 8 divisors (see below), whose sum is σ = 489968370. Its totient is φ = 130658224.

The previous prime is 261316441. The next prime is 261316463. The reversal of 261316456 is 654613162.

It can be written as a sum of positive squares in only one way, i.e., 164608900 + 96707556 = 12830^2 + 9834^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×261316456³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16332271 + ... + 16332286.

Almost surely, 2^261316456 is an apocalyptic number.

It is an amenable number.

261316456 is a deficient number, since it is larger than the sum of its proper divisors (228651914).

261316456 is a wasteful number, since it uses less digits than its factorization.

261316456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32664563 (or 32664559 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 261316456 is about 16165.2855217593. The cubic root of 261316456 is about 639.3258330602.

The spelling of 261316456 in words is "two hundred sixty-one million, three hundred sixteen thousand, four hundred fifty-six".