261011642 has 16 divisors (see below), whose sum is σ = 416524032. Its totient is φ = 122243520.

The previous prime is 261011603. The next prime is 261011711. The reversal of 261011642 is 246110162.

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 in 7 ways as a sum of consecutive naturals, for example, 11018 + ... + 25365.

It is an arithmetic number, because the mean of its divisors is an integer number (26032752).

Almost surely, 2^261011642 is an apocalyptic number.

261011642 is a deficient number, since it is larger than the sum of its proper divisors (155512390).

261011642 is a wasteful number, since it uses less digits than its factorization.

261011642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36613.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 261011642 is about 16155.8547282402. The cubic root of 261011642 is about 639.0771546471.

The spelling of 261011642 in words is "two hundred sixty-one million, eleven thousand, six hundred forty-two".