261220547 has 8 divisors (see below), whose sum is σ = 299788800. Its totient is φ = 222965064.

The previous prime is 261220537. The next prime is 261220549. The reversal of 261220547 is 745022162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261220547 - 2¹⁰ = 261219523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261220549) 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, 76397 + ... + 79742.

It is an arithmetic number, because the mean of its divisors is an integer number (37473600).

Almost surely, 2^261220547 is an apocalyptic number.

261220547 is a deficient number, since it is larger than the sum of its proper divisors (38568253).

261220547 is a wasteful number, since it uses less digits than its factorization.

261220547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156385.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 261220547 is about 16162.3187383494. The cubic root of 261220547 is about 639.2476078496.

The spelling of 261220547 in words is "two hundred sixty-one million, two hundred twenty thousand, five hundred forty-seven".