261042242 has 8 divisors (see below), whose sum is σ = 414596556. Its totient is φ = 122843392.

The previous prime is 261042193. The next prime is 261042263. The reversal of 261042242 is 242240162.

It can be written as a sum of positive squares in 2 ways, for example, as 221741881 + 39300361 = 14891^2 + 6269^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3838823 + ... + 3838890.

Almost surely, 2^261042242 is an apocalyptic number.

261042242 is a deficient number, since it is larger than the sum of its proper divisors (153554314).

261042242 is a wasteful number, since it uses less digits than its factorization.

261042242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7677732.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 261042242 is about 16156.8017255891. The cubic root of 261042242 is about 639.1021279862.

The spelling of 261042242 in words is "two hundred sixty-one million, forty-two thousand, two hundred forty-two".