261601204 has 24 divisors (see below), whose sum is σ = 467970048. Its totient is φ = 127925280.

The previous prime is 261601183. The next prime is 261601217. The reversal of 261601204 is 402106162.

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, 32442 + ... + 39694.

It is an arithmetic number, because the mean of its divisors is an integer number (19498752).

Almost surely, 2^261601204 is an apocalyptic number.

It is an amenable number.

261601204 is a deficient number, since it is larger than the sum of its proper divisors (206368844).

261601204 is a wasteful number, since it uses less digits than its factorization.

261601204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7455 (or 7453 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 261601204 is about 16174.0905153891. The cubic root of 261601204 is about 639.5579662518.

Adding to 261601204 its reverse (402106162), we get a palindrome (663707366).

The spelling of 261601204 in words is "two hundred sixty-one million, six hundred one thousand, two hundred four".