261133104 has 20 divisors (see below), whose sum is σ = 674593976. Its totient is φ = 87044352.

The previous prime is 261133091. The next prime is 261133123. The reversal of 261133104 is 401331162.

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, 2720089 + ... + 2720184.

Almost surely, 2^261133104 is an apocalyptic number.

261133104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261133104 is an abundant number, since it is smaller than the sum of its proper divisors (413460872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261133104 is a wasteful number, since it uses less digits than its factorization.

261133104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440284 (or 5440278 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 261133104 is about 16159.6133617114. The cubic root of 261133104 is about 639.1762709817.

Adding to 261133104 its reverse (401331162), we get a palindrome (662464266).

The spelling of 261133104 in words is "two hundred sixty-one million, one hundred thirty-three thousand, one hundred four".