231070321 has 2 divisors, whose sum is σ = 231070322. Its totient is φ = 231070320.

The previous prime is 231070319. The next prime is 231070429. The reversal of 231070321 is 123070132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124567921 + 106502400 = 11161^2 + 10320^2 .

It is a cyclic number.

It is not a de Polignac number, because 231070321 - 2¹ = 231070319 is a prime.

Together with 231070319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (231073321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115535160 + 115535161.

It is an arithmetic number, because the mean of its divisors is an integer number (115535161).

Almost surely, 2^231070321 is an apocalyptic number.

It is an amenable number.

231070321 is a deficient number, since it is larger than the sum of its proper divisors (1).

231070321 is an equidigital number, since it uses as much as digits as its factorization.

231070321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 231070321 is about 15200.9973685939. The cubic root of 231070321 is about 613.6414995628.

The spelling of 231070321 in words is "two hundred thirty-one million, seventy thousand, three hundred twenty-one".