261963481 has 8 divisors (see below), whose sum is σ = 286896960. Its totient is φ = 237713232.

The previous prime is 261963479. The next prime is 261963497. The reversal of 261963481 is 184369162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261963481 - 2¹ = 261963479 is a prime.

It is a super-2 number, since 2×261963481² = 137249730755274722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261913481) 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 7 ways as a sum of consecutive naturals, for example, 170005 + ... + 171538.

It is an arithmetic number, because the mean of its divisors is an integer number (35862120).

Almost surely, 2^261963481 is an apocalyptic number.

It is an amenable number.

261963481 is a deficient number, since it is larger than the sum of its proper divisors (24933479).

261963481 is a wasteful number, since it uses less digits than its factorization.

261963481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341615.

The product of its digits is 62208, while the sum is 40.

The square root of 261963481 is about 16185.2859412492. The cubic root of 261963481 is about 639.8530595276.

The spelling of 261963481 in words is "two hundred sixty-one million, nine hundred sixty-three thousand, four hundred eighty-one".