231061213 has 2 divisors, whose sum is σ = 231061214. Its totient is φ = 231061212.

The previous prime is 231061211. The next prime is 231061249. The reversal of 231061213 is 312160132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195384484 + 35676729 = 13978^2 + 5973^2 .

It is a cyclic number.

It is not a de Polignac number, because 231061213 - 2¹ = 231061211 is a prime.

Together with 231061211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231061211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115530606 + 115530607.

It is an arithmetic number, because the mean of its divisors is an integer number (115530607).

Almost surely, 2^231061213 is an apocalyptic number.

It is an amenable number.

231061213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231061213 is an equidigital number, since it uses as much as digits as its factorization.

231061213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 231061213 is about 15200.6977800363. The cubic root of 231061213 is about 613.6334369087.

The spelling of 231061213 in words is "two hundred thirty-one million, sixty-one thousand, two hundred thirteen".