261641404 has 6 divisors (see below), whose sum is σ = 457872464. Its totient is φ = 130820700.

The previous prime is 261641371. The next prime is 261641423. The reversal of 261641404 is 404146162.

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, 32705172 + ... + 32705179.

Almost surely, 2^261641404 is an apocalyptic number.

It is an amenable number.

261641404 is a deficient number, since it is larger than the sum of its proper divisors (196231060).

261641404 is a wasteful number, since it uses less digits than its factorization.

261641404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65410355 (or 65410353 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 261641404 is about 16175.3331959499. Note that the first 3 decimals coincide. The cubic root of 261641404 is about 639.5907246553.

Adding to 261641404 its reverse (404146162), we get a palindrome (665787566).

The spelling of 261641404 in words is "two hundred sixty-one million, six hundred forty-one thousand, four hundred four".