261264635 has 8 divisors (see below), whose sum is σ = 313788816. Its totient is φ = 208830880.

The previous prime is 261264623. The next prime is 261264637. The reversal of 261264635 is 536462162.

It is a happy number.

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

It is not a de Polignac number, because 261264635 - 2⁸ = 261264379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261264595 and 261264604.

It is not an unprimeable number, because it can be changed into a prime (261264637) by changing a digit.

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, 16076 + ... + 27945.

It is an arithmetic number, because the mean of its divisors is an integer number (39223602).

Almost surely, 2^261264635 is an apocalyptic number.

261264635 is a deficient number, since it is larger than the sum of its proper divisors (52524181).

261264635 is a wasteful number, since it uses less digits than its factorization.

261264635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45213.

The product of its digits is 51840, while the sum is 35.

The square root of 261264635 is about 16163.6825940130. The cubic root of 261264635 is about 639.2835692411.

The spelling of 261264635 in words is "two hundred sixty-one million, two hundred sixty-four thousand, six hundred thirty-five".