231717949 has 2 divisors, whose sum is σ = 231717950. Its totient is φ = 231717948.

The previous prime is 231717911. The next prime is 231718043. The reversal of 231717949 is 949717132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193710724 + 38007225 = 13918^2 + 6165^2 .

It is a cyclic number.

It is not a de Polignac number, because 231717949 - 2⁷ = 231717821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231717049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115858974 + 115858975.

It is an arithmetic number, because the mean of its divisors is an integer number (115858975).

Almost surely, 2^231717949 is an apocalyptic number.

It is an amenable number.

231717949 is a deficient number, since it is larger than the sum of its proper divisors (1).

231717949 is an equidigital number, since it uses as much as digits as its factorization.

231717949 is an odious number, because the sum of its binary digits is odd.

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

The square root of 231717949 is about 15222.2846182825. The cubic root of 231717949 is about 614.2142555291.

The spelling of 231717949 in words is "two hundred thirty-one million, seven hundred seventeen thousand, nine hundred forty-nine".