261120404 has 12 divisors (see below), whose sum is σ = 458272500. Its totient is φ = 130185408.

The previous prime is 261120389. The next prime is 261120427. The reversal of 261120404 is 404021162.

It can be written as a sum of positive squares in 2 ways, for example, as 117072400 + 144048004 = 10820^2 + 12002^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92129 + ... + 94920.

It is an arithmetic number, because the mean of its divisors is an integer number (38189375).

Almost surely, 2^261120404 is an apocalyptic number.

It is an amenable number.

261120404 is a deficient number, since it is larger than the sum of its proper divisors (197152096).

261120404 is a wasteful number, since it uses less digits than its factorization.

261120404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187402 (or 187400 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 261120404 is about 16159.2204019872. The cubic root of 261120404 is about 639.1659088712.

Adding to 261120404 its reverse (404021162), we get a palindrome (665141566).

The spelling of 261120404 in words is "two hundred sixty-one million, one hundred twenty thousand, four hundred four".