261042311929 has 15 divisors (see below), whose sum is σ = 304560452357. Its totient is φ = 223729094316.

The previous prime is 261042311911. The next prime is 261042311941. The reversal of 261042311929 is 929113240162.

The square root of 261042311929 is 510923.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 261042311929 - 2⁷ = 261042311801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261042311891 and 261042311900.

It is not an unprimeable number, because it can be changed into a prime (261042311729) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 25030014 + ... + 25040440.

Almost surely, 2^261042311929 is an apocalyptic number.

261042311929 is the 510923-rd square number.

261042311929 is the 255462-nd centered octagonal number.

It is an amenable number.

261042311929 is a deficient number, since it is larger than the sum of its proper divisors (43518140428).

261042311929 is an frugal number, since it uses more digits than its factorization.

261042311929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20882 (or 10434 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 261042311929 in words is "two hundred sixty-one billion, forty-two million, three hundred eleven thousand, nine hundred twenty-nine".