261213104 has 20 divisors (see below), whose sum is σ = 507910200. Its totient is φ = 130139520.

The previous prime is 261213103. The next prime is 261213133. The reversal of 261213104 is 401312162.

It is not an unprimeable number, because it can be changed into a prime (261213103) 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, 24554 + ... + 33545.

It is an arithmetic number, because the mean of its divisors is an integer number (25395510).

Almost surely, 2^261213104 is an apocalyptic number.

It is an amenable number.

261213104 is a deficient number, since it is larger than the sum of its proper divisors (246697096).

261213104 is a wasteful number, since it uses less digits than its factorization.

261213104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58388 (or 58382 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 261213104 is about 16162.0884789064. The cubic root of 261213104 is about 639.2415363962.

Adding to 261213104 its reverse (401312162), we get a palindrome (662525266).

The spelling of 261213104 in words is "two hundred sixty-one million, two hundred thirteen thousand, one hundred four".