231951971 has 2 divisors, whose sum is σ = 231951972. Its totient is φ = 231951970.

The previous prime is 231951931. The next prime is 231951977. The reversal of 231951971 is 179159132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231951971 - 2¹⁰ = 231950947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231951977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115975985 + 115975986.

It is an arithmetic number, because the mean of its divisors is an integer number (115975986).

Almost surely, 2^231951971 is an apocalyptic number.

231951971 is a deficient number, since it is larger than the sum of its proper divisors (1).

231951971 is an equidigital number, since it uses as much as digits as its factorization.

231951971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 38.

The square root of 231951971 is about 15229.9695009544. The cubic root of 231951971 is about 614.4209598243.

The spelling of 231951971 in words is "two hundred thirty-one million, nine hundred fifty-one thousand, nine hundred seventy-one".