261560623 has 16 divisors (see below), whose sum is σ = 290062080. Its totient is φ = 234596736.

The previous prime is 261560591. The next prime is 261560627. The reversal of 261560623 is 326065162.

It is not a de Polignac number, because 261560623 - 2⁵ = 261560591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261560627) 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, 118948 + ... + 121126.

It is an arithmetic number, because the mean of its divisors is an integer number (18128880).

Almost surely, 2^261560623 is an apocalyptic number.

261560623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261560623 is a deficient number, since it is larger than the sum of its proper divisors (28501457).

261560623 is a wasteful number, since it uses less digits than its factorization.

261560623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 261560623 is about 16172.8359603379. The cubic root of 261560623 is about 639.5248939728.

The spelling of 261560623 in words is "two hundred sixty-one million, five hundred sixty thousand, six hundred twenty-three".