261697364 has 6 divisors (see below), whose sum is σ = 457970394. Its totient is φ = 130848680.

The previous prime is 261697357. The next prime is 261697379. The reversal of 261697364 is 463796162.

It can be written as a sum of positive squares in only one way, i.e., 187909264 + 73788100 = 13708^2 + 8590^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32712167 + ... + 32712174.

It is an arithmetic number, because the mean of its divisors is an integer number (76328399).

Almost surely, 2^261697364 is an apocalyptic number.

It is an amenable number.

261697364 is a deficient number, since it is larger than the sum of its proper divisors (196273030).

261697364 is a wasteful number, since it uses less digits than its factorization.

261697364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65424345 (or 65424343 counting only the distinct ones).

The product of its digits is 326592, while the sum is 44.

The square root of 261697364 is about 16177.0628978192. The cubic root of 261697364 is about 639.6363200708.

It can be divided in two parts, 26169 and 7364, that added together give a palindrome (33533).

The spelling of 261697364 in words is "two hundred sixty-one million, six hundred ninety-seven thousand, three hundred sixty-four".