261217804 has 12 divisors (see below), whose sum is σ = 463570128. Its totient is φ = 128769200.

The previous prime is 261217777. The next prime is 261217807. The reversal of 261217804 is 408712162.

It is a super-2 number, since 2×261217804² = 136469482253164832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261217807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459607 + ... + 460174.

It is an arithmetic number, because the mean of its divisors is an integer number (38630844).

Almost surely, 2^261217804 is an apocalyptic number.

It is an amenable number.

261217804 is a deficient number, since it is larger than the sum of its proper divisors (202352324).

261217804 is a wasteful number, since it uses less digits than its factorization.

261217804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919856 (or 919854 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 261217804 is about 16162.2338802531. The cubic root of 261217804 is about 639.2453703248.

Adding to 261217804 its reverse (408712162), we get a palindrome (669929966).

The spelling of 261217804 in words is "two hundred sixty-one million, two hundred seventeen thousand, eight hundred four".