261381084 has 24 divisors (see below), whose sum is σ = 610153488. Its totient is φ = 87089280.

The previous prime is 261381083. The next prime is 261381097. The reversal of 261381084 is 480183162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261381083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45544 + ... + 50960.

It is an arithmetic number, because the mean of its divisors is an integer number (25423062).

Almost surely, 2^261381084 is an apocalyptic number.

It is an amenable number.

261381084 is an abundant number, since it is smaller than the sum of its proper divisors (348772404).

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

261381084 is a wasteful number, since it uses less digits than its factorization.

261381084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9445 (or 9443 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 261381084 is about 16167.2843730789. The cubic root of 261381084 is about 639.3785340966.

The spelling of 261381084 in words is "two hundred sixty-one million, three hundred eighty-one thousand, eighty-four".