261260042 has 8 divisors (see below), whose sum is σ = 392048100. Its totient is φ = 130577344.

The previous prime is 261260039. The next prime is 261260057. The reversal of 261260042 is 240062162.

It can be written as a sum of positive squares in 2 ways, for example, as 258534241 + 2725801 = 16079^2 + 1651^2 .

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

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, 19817 + ... + 30252.

Almost surely, 2^261260042 is an apocalyptic number.

261260042 is a deficient number, since it is larger than the sum of its proper divisors (130788058).

261260042 is a wasteful number, since it uses less digits than its factorization.

261260042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52680.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 261260042 is about 16163.5405156172. The cubic root of 261260042 is about 639.2798230438.

The spelling of 261260042 in words is "two hundred sixty-one million, two hundred sixty thousand, forty-two".