261928553 has 8 divisors (see below), whose sum is σ = 266753760. Its totient is φ = 257116320.

The previous prime is 261928543. The next prime is 261928561. The reversal of 261928553 is 355829162.

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

It is a cyclic number.

It is not a de Polignac number, because 261928553 - 2⁸ = 261928297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261928553.

It is not an unprimeable number, because it can be changed into a prime (261928543) 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 7 ways as a sum of consecutive naturals, for example, 43613 + ... + 49253.

It is an arithmetic number, because the mean of its divisors is an integer number (33344220).

Almost surely, 2^261928553 is an apocalyptic number.

It is an amenable number.

261928553 is a deficient number, since it is larger than the sum of its proper divisors (4825207).

261928553 is an equidigital number, since it uses as much as digits as its factorization.

261928553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6487.

The product of its digits is 129600, while the sum is 41.

The square root of 261928553 is about 16184.2069005559. The cubic root of 261928553 is about 639.8246207277.

The spelling of 261928553 in words is "two hundred sixty-one million, nine hundred twenty-eight thousand, five hundred fifty-three".