261164535 has 8 divisors (see below), whose sum is σ = 417863280. Its totient is φ = 139287744.

The previous prime is 261164531. The next prime is 261164543. The reversal of 261164535 is 535461162.

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

It is not a de Polignac number, because 261164535 - 2² = 261164531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261164496 and 261164505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261164531) 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, 8705470 + ... + 8705499.

It is an arithmetic number, because the mean of its divisors is an integer number (52232910).

Almost surely, 2^261164535 is an apocalyptic number.

261164535 is a deficient number, since it is larger than the sum of its proper divisors (156698745).

261164535 is a wasteful number, since it uses less digits than its factorization.

261164535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17410977.

The product of its digits is 21600, while the sum is 33.

The square root of 261164535 is about 16160.5858495291. The cubic root of 261164535 is about 639.2019145367.

The spelling of 261164535 in words is "two hundred sixty-one million, one hundred sixty-four thousand, five hundred thirty-five".