261309542311 has 8 divisors (see below), whose sum is σ = 267793523424. Its totient is φ = 254830826880.

The previous prime is 261309542309. The next prime is 261309542339. The reversal of 261309542311 is 113245903162.

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 261309542311 - 2¹ = 261309542309 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 (261309542381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1215846 + ... + 1414531.

It is an arithmetic number, because the mean of its divisors is an integer number (33474190428).

Almost surely, 2^261309542311 is an apocalyptic number.

261309542311 is a deficient number, since it is larger than the sum of its proper divisors (6483981113).

261309542311 is a wasteful number, since it uses less digits than its factorization.

261309542311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632841.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 261309542311 in words is "two hundred sixty-one billion, three hundred nine million, five hundred forty-two thousand, three hundred eleven".