2231011261 has 2 divisors, whose sum is σ = 2231011262. Its totient is φ = 2231011260.

The previous prime is 2231011229. The next prime is 2231011297. The reversal of 2231011261 is 1621101322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1926683236 + 304328025 = 43894^2 + 17445^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231011261 - 2⁵ = 2231011229 is a prime.

It is a super-3 number, since 3×2231011261³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2231015261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115505630 + 1115505631.

It is an arithmetic number, because the mean of its divisors is an integer number (1115505631).

Almost surely, 2^2231011261 is an apocalyptic number.

2231011261 is the 21124-th centered decagonal number.

It is an amenable number.

2231011261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231011261 is an equidigital number, since it uses as much as digits as its factorization.

2231011261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2231011261 is about 47233.5819200704. The cubic root of 2231011261 is about 1306.6740134412.

Adding to 2231011261 its reverse (1621101322), we get a palindrome (3852112583).

The spelling of 2231011261 in words is "two billion, two hundred thirty-one million, eleven thousand, two hundred sixty-one".