261424544 has 12 divisors (see below), whose sum is σ = 514679634. Its totient is φ = 130712256.

The previous prime is 261424543. The next prime is 261424561. The reversal of 261424544 is 445424162.

It can be written as a sum of positive squares in only one way, i.e., 236544400 + 24880144 = 15380^2 + 4988^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 8169517 = 261424544 / (2 + 6 + 1 + 4 + 2 + 4 + 5 + 4 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 261424544.

It is not an unprimeable number, because it can be changed into a prime (261424543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4084727 + ... + 4084790.

Almost surely, 2^261424544 is an apocalyptic number.

It is an amenable number.

261424544 is a deficient number, since it is larger than the sum of its proper divisors (253255090).

261424544 is an equidigital number, since it uses as much as digits as its factorization.

261424544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8169527 (or 8169519 counting only the distinct ones).

The product of its digits is 30720, while the sum is 32.

The square root of 261424544 is about 16168.6283895697. The cubic root of 261424544 is about 639.4139687587.

The spelling of 261424544 in words is "two hundred sixty-one million, four hundred twenty-four thousand, five hundred forty-four".