261262556 has 12 divisors (see below), whose sum is σ = 459579792. Its totient is φ = 129954048.

The previous prime is 261262553. The next prime is 261262567. The reversal of 261262556 is 655262162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261262553) 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, 168440 + ... + 169983.

It is an arithmetic number, because the mean of its divisors is an integer number (38298316).

Almost surely, 2^261262556 is an apocalyptic number.

It is an amenable number.

261262556 is a deficient number, since it is larger than the sum of its proper divisors (198317236).

261262556 is a wasteful number, since it uses less digits than its factorization.

261262556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338620 (or 338618 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 261262556 is about 16163.6182830454. The cubic root of 261262556 is about 639.2818735478.

It can be divided in two parts, 26126 and 2556, that added together give a palindrome (28682).

The spelling of 261262556 in words is "two hundred sixty-one million, two hundred sixty-two thousand, five hundred fifty-six".