231197387 has 2 divisors, whose sum is σ = 231197388. Its totient is φ = 231197386.

The previous prime is 231197359. The next prime is 231197431. The reversal of 231197387 is 783791132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231197387 - 2²⁰ = 230148811 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231199387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115598693 + 115598694.

It is an arithmetic number, because the mean of its divisors is an integer number (115598694).

Almost surely, 2^231197387 is an apocalyptic number.

231197387 is a deficient number, since it is larger than the sum of its proper divisors (1).

231197387 is an equidigital number, since it uses as much as digits as its factorization.

231197387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 231197387 is about 15205.1763225554. The cubic root of 231197387 is about 613.7539598192.

The spelling of 231197387 in words is "two hundred thirty-one million, one hundred ninety-seven thousand, three hundred eighty-seven".