261024563 has 8 divisors (see below), whose sum is σ = 274057680. Its totient is φ = 248260320.

The previous prime is 261024521. The next prime is 261024581. The reversal of 261024563 is 365420162.

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 261024563 - 2²⁰ = 259975987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261024503) 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, 65228 + ... + 69113.

It is an arithmetic number, because the mean of its divisors is an integer number (34257210).

Almost surely, 2^261024563 is an apocalyptic number.

261024563 is a deficient number, since it is larger than the sum of its proper divisors (13033117).

261024563 is a wasteful number, since it uses less digits than its factorization.

261024563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134437.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 261024563 is about 16156.2546092837. The cubic root of 261024563 is about 639.0877000000.

The spelling of 261024563 in words is "two hundred sixty-one million, twenty-four thousand, five hundred sixty-three".