261424244 has 6 divisors (see below), whose sum is σ = 457492434. Its totient is φ = 130712120.

The previous prime is 261424243. The next prime is 261424253. The reversal of 261424244 is 442424162.

It can be written as a sum of positive squares in only one way, i.e., 255616144 + 5808100 = 15988^2 + 2410^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261424243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32678027 + ... + 32678034.

It is an arithmetic number, because the mean of its divisors is an integer number (76248739).

Almost surely, 2^261424244 is an apocalyptic number.

It is an amenable number.

261424244 is a deficient number, since it is larger than the sum of its proper divisors (196068190).

261424244 is a wasteful number, since it uses less digits than its factorization.

261424244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65356065 (or 65356063 counting only the distinct ones).

The product of its digits is 12288, while the sum is 29.

The square root of 261424244 is about 16168.6191123423. The cubic root of 261424244 is about 639.4137241702.

The spelling of 261424244 in words is "two hundred sixty-one million, four hundred twenty-four thousand, two hundred forty-four".