261513234 has 24 divisors (see below), whose sum is σ = 567354060. Its totient is φ = 87056928.

The previous prime is 261513233. The next prime is 261513251. The reversal of 261513234 is 432315162.

261513234 is a `hidden beast` number, since 2 + 615 + 13 + 2 + 34 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 227255625 + 34257609 = 15075^2 + 5853^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261513198 and 261513207.

It is not an unprimeable number, because it can be changed into a prime (261513233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5232 + ... + 23460.

Almost surely, 2^261513234 is an apocalyptic number.

261513234 is an abundant number, since it is smaller than the sum of its proper divisors (305840826).

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

261513234 is a wasteful number, since it uses less digits than its factorization.

261513234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19034 (or 19031 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 261513234 is about 16171.3708138797. The cubic root of 261513234 is about 639.4862690512.

Adding to 261513234 its reverse (432315162), we get a palindrome (693828396).

The spelling of 261513234 in words is "two hundred sixty-one million, five hundred thirteen thousand, two hundred thirty-four".