261123336 has 48 divisors (see below), whose sum is σ = 716911260. Its totient is φ = 85847040.

The previous prime is 261123311. The next prime is 261123367. The reversal of 261123336 is 633321162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 253000836 + 8122500 = 15906^2 + 2850^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19585 + ... + 30096.

Almost surely, 2^261123336 is an apocalyptic number.

It is an amenable number.

261123336 is an abundant number, since it is smaller than the sum of its proper divisors (455787924).

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

261123336 is a wasteful number, since it uses less digits than its factorization.

261123336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49766 (or 49759 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 261123336 is about 16159.3111239310. The cubic root of 261123336 is about 639.1683011615.

Adding to 261123336 its reverse (633321162), we get a palindrome (894444498).

The spelling of 261123336 in words is "two hundred sixty-one million, one hundred twenty-three thousand, three hundred thirty-six".