261523531259 has 4 divisors (see below), whose sum is σ = 261527978040. Its totient is φ = 261519084480.

The previous prime is 261523531231. The next prime is 261523531289. The reversal of 261523531259 is 952135325162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261523531259 - 2¹² = 261523527163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261523531289) 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, 2133974 + ... + 2253195.

It is an arithmetic number, because the mean of its divisors is an integer number (65381994510).

Almost surely, 2^261523531259 is an apocalyptic number.

261523531259 is a deficient number, since it is larger than the sum of its proper divisors (4446781).

261523531259 is an equidigital number, since it uses as much as digits as its factorization.

261523531259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446780.

The product of its digits is 486000, while the sum is 44.

The spelling of 261523531259 in words is "two hundred sixty-one billion, five hundred twenty-three million, five hundred thirty-one thousand, two hundred fifty-nine".