261917242 has 8 divisors (see below), whose sum is σ = 413553600. Its totient is φ = 124066044.

The previous prime is 261917239. The next prime is 261917263. The reversal of 261917242 is 242719162.

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

It is a junction number, because it is equal to n+sod(n) for n = 261917198 and 261917207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446242 + ... + 3446317.

It is an arithmetic number, because the mean of its divisors is an integer number (51694200).

Almost surely, 2^261917242 is an apocalyptic number.

261917242 is a deficient number, since it is larger than the sum of its proper divisors (151636358).

261917242 is a wasteful number, since it uses less digits than its factorization.

261917242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6892580.

The product of its digits is 12096, while the sum is 34.

The square root of 261917242 is about 16183.8574511765. The cubic root of 261917242 is about 639.8154106329.

It can be divided in two parts, 26191 and 7242, that added together give a palindrome (33433).

The spelling of 261917242 in words is "two hundred sixty-one million, nine hundred seventeen thousand, two hundred forty-two".