261799124 has 48 divisors (see below), whose sum is σ = 490897680. Its totient is φ = 121927680.

The previous prime is 261799121. The next prime is 261799141. The reversal of 261799124 is 421997162.

It can be written as a sum of positive squares in 8 ways, for example, as 12475024 + 249324100 = 3532^2 + 15790^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261799121) 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 15 ways as a sum of consecutive naturals, for example, 776684 + ... + 777020.

It is an arithmetic number, because the mean of its divisors is an integer number (10227035).

Almost surely, 2^261799124 is an apocalyptic number.

It is an amenable number.

261799124 is a deficient number, since it is larger than the sum of its proper divisors (229098556).

261799124 is a wasteful number, since it uses less digits than its factorization.

261799124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 586 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 261799124 is about 16180.2077860576. The cubic root of 261799124 is about 639.7192160238.

It can be divided in two parts, 261 and 799124, that multiplied together give a square (208571364 = 14442²).

The spelling of 261799124 in words is "two hundred sixty-one million, seven hundred ninety-nine thousand, one hundred twenty-four".