261348261 has 16 divisors (see below), whose sum is σ = 360897600. Its totient is φ = 168029568.

The previous prime is 261348257. The next prime is 261348289. The reversal of 261348261 is 162843162.

It is not a de Polignac number, because 261348261 - 2² = 261348257 is a prime.

It is a super-3 number, since 3×261348261³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261348251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139050 + ... + 140916.

It is an arithmetic number, because the mean of its divisors is an integer number (22556100).

Almost surely, 2^261348261 is an apocalyptic number.

It is an amenable number.

261348261 is a deficient number, since it is larger than the sum of its proper divisors (99549339).

261348261 is a wasteful number, since it uses less digits than its factorization.

261348261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508.

The product of its digits is 13824, while the sum is 33.

The square root of 261348261 is about 16166.2692356647. The cubic root of 261348261 is about 639.3517695990.

The spelling of 261348261 in words is "two hundred sixty-one million, three hundred forty-eight thousand, two hundred sixty-one".