261213126 has 32 divisors (see below), whose sum is σ = 560750688. Its totient is φ = 80824320.

The previous prime is 261213103. The next prime is 261213133. The reversal of 261213126 is 621312162.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 261213096 and 261213105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10095 + ... + 24986.

It is an arithmetic number, because the mean of its divisors is an integer number (17523459).

Almost surely, 2^261213126 is an apocalyptic number.

261213126 is an abundant number, since it is smaller than the sum of its proper divisors (299537562).

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

261213126 is a wasteful number, since it uses less digits than its factorization.

261213126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35176.

The product of its digits is 864, while the sum is 24.

The square root of 261213126 is about 16162.0891595115. The cubic root of 261213126 is about 639.2415543423.

Adding to 261213126 its reverse (621312162), we get a palindrome (882525288).

The spelling of 261213126 in words is "two hundred sixty-one million, two hundred thirteen thousand, one hundred twenty-six".