231749971 has 2 divisors, whose sum is σ = 231749972. Its totient is φ = 231749970.

The previous prime is 231749957. The next prime is 231749983. The reversal of 231749971 is 179947132.

It is a happy number.

231749971 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 is a cyclic number.

It is not a de Polignac number, because 231749971 - 2¹⁷ = 231618899 is a prime.

It is not a weakly prime, because it can be changed into another prime (231749911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115874985 + 115874986.

It is an arithmetic number, because the mean of its divisors is an integer number (115874986).

Almost surely, 2^231749971 is an apocalyptic number.

231749971 is a deficient number, since it is larger than the sum of its proper divisors (1).

231749971 is an equidigital number, since it uses as much as digits as its factorization.

231749971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 231749971 is about 15223.3363951533. The cubic root of 231749971 is about 614.2425477741.

The spelling of 231749971 in words is "two hundred thirty-one million, seven hundred forty-nine thousand, nine hundred seventy-one".