261109250 has 16 divisors (see below), whose sum is σ = 488796984. Its totient is φ = 104443600.

The previous prime is 261109241. The next prime is 261109253. The reversal of 261109250 is 52901162.

It can be written as a sum of positive squares in 4 ways, for example, as 124523281 + 136585969 = 11159^2 + 11687^2 .

It is not an unprimeable number, because it can be changed into a prime (261109253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521969 + ... + 522468.

Almost surely, 2^261109250 is an apocalyptic number.

261109250 is a deficient number, since it is larger than the sum of its proper divisors (227687734).

261109250 is a wasteful number, since it uses less digits than its factorization.

261109250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044454 (or 1044444 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 261109250 is about 16158.8752702656. The cubic root of 261109250 is about 639.1568078869.

The spelling of 261109250 in words is "two hundred sixty-one million, one hundred nine thousand, two hundred fifty".