261995342 has 16 divisors (see below), whose sum is σ = 452152800. Its totient is φ = 111529248.

The previous prime is 261995333. The next prime is 261995387. The reversal of 261995342 is 243599162.

It is a self number, because there is not a number n which added to its sum of digits gives 261995342.

It is a congruent number.

It is an unprimeable number.

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, 60713 + ... + 64884.

It is an arithmetic number, because the mean of its divisors is an integer number (28259550).

Almost surely, 2^261995342 is an apocalyptic number.

261995342 is a deficient number, since it is larger than the sum of its proper divisors (190157458).

261995342 is a wasteful number, since it uses less digits than its factorization.

261995342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125755.

The product of its digits is 116640, while the sum is 41.

The square root of 261995342 is about 16186.2701694986. The cubic root of 261995342 is about 639.8789989344.

The spelling of 261995342 in words is "two hundred sixty-one million, nine hundred ninety-five thousand, three hundred forty-two".