231121013 has 2 divisors, whose sum is σ = 231121014. Its totient is φ = 231121012.

The previous prime is 231120983. The next prime is 231121021. The reversal of 231121013 is 310121132.

231121013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230827249 + 293764 = 15193^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 231121013 - 2¹⁰ = 231119989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231121063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115560506 + 115560507.

It is an arithmetic number, because the mean of its divisors is an integer number (115560507).

Almost surely, 2^231121013 is an apocalyptic number.

It is an amenable number.

231121013 is a deficient number, since it is larger than the sum of its proper divisors (1).

231121013 is an equidigital number, since it uses as much as digits as its factorization.

231121013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 231121013 is about 15202.6646677482. The cubic root of 231121013 is about 613.6863696559.

Adding to 231121013 its reverse (310121132), we get a palindrome (541242145).

The spelling of 231121013 in words is "two hundred thirty-one million, one hundred twenty-one thousand, thirteen".