261131244 has 24 divisors (see below), whose sum is σ = 664698048. Its totient is φ = 79130640.

The previous prime is 261131243. The next prime is 261131287. The reversal of 261131244 is 442131162.

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

It is not an unprimeable number, because it can be changed into a prime (261131243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 989002 + ... + 989265.

It is an arithmetic number, because the mean of its divisors is an integer number (27695752).

Almost surely, 2^261131244 is an apocalyptic number.

It is an amenable number.

261131244 is an abundant number, since it is smaller than the sum of its proper divisors (403566804).

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

261131244 is a wasteful number, since it uses less digits than its factorization.

261131244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978285 (or 1978283 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 261131244 is about 16159.5558107270. Note that the first 3 decimals coincide. The cubic root of 261131244 is about 639.1747534022.

The spelling of 261131244 in words is "two hundred sixty-one million, one hundred thirty-one thousand, two hundred forty-four".