261504017 has 4 divisors (see below), whose sum is σ = 261536436. Its totient is φ = 261471600.

The previous prime is 261503993. The next prime is 261504029. The reversal of 261504017 is 710405162.

261504017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 125641681 + 135862336 = 11209^2 + 11656^2 .

It is a cyclic number.

It is not a de Polignac number, because 261504017 - 2⁶ = 261503953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261504037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6443 + ... + 23759.

It is an arithmetic number, because the mean of its divisors is an integer number (65384109).

Almost surely, 2^261504017 is an apocalyptic number.

It is an amenable number.

261504017 is a deficient number, since it is larger than the sum of its proper divisors (32419).

261504017 is a wasteful number, since it uses less digits than its factorization.

261504017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32418.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 261504017 is about 16171.0858324356. The cubic root of 261504017 is about 639.4787560928.

Adding to 261504017 its reverse (710405162), we get a palindrome (971909179).

The spelling of 261504017 in words is "two hundred sixty-one million, five hundred four thousand, seventeen".