231211621061 has 4 divisors (see below), whose sum is σ = 232046320332. Its totient is φ = 230376921792.

The previous prime is 231211621009. The next prime is 231211621093. The reversal of 231211621061 is 160126112132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 91881128161 + 139330492900 = 303119^2 + 373270^2 .

It is a cyclic number.

It is not a de Polignac number, because 231211621061 - 2²² = 231207426757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231211621061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231211621001) 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, 417349220 + ... + 417349773.

It is an arithmetic number, because the mean of its divisors is an integer number (58011580083).

Almost surely, 2^231211621061 is an apocalyptic number.

It is an amenable number.

231211621061 is a deficient number, since it is larger than the sum of its proper divisors (834699271).

231211621061 is an equidigital number, since it uses as much as digits as its factorization.

231211621061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834699270.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 231211621061 its reverse (160126112132), we get a palindrome (391337733193).

The spelling of 231211621061 in words is "two hundred thirty-one billion, two hundred eleven million, six hundred twenty-one thousand, sixty-one".