231756949 has 2 divisors, whose sum is σ = 231756950. Its totient is φ = 231756948.

The previous prime is 231756929. The next prime is 231756977. The reversal of 231756949 is 949657132.

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., 231252849 + 504100 = 15207^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 231756949 - 2²¹ = 229659797 is a prime.

It is a super-2 number, since 2×231756949² = 107422566819577202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231756899 and 231756908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231756929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115878474 + 115878475.

It is an arithmetic number, because the mean of its divisors is an integer number (115878475).

Almost surely, 2^231756949 is an apocalyptic number.

It is an amenable number.

231756949 is a deficient number, since it is larger than the sum of its proper divisors (1).

231756949 is an equidigital number, since it uses as much as digits as its factorization.

231756949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 46.

The square root of 231756949 is about 15223.5655810326. The cubic root of 231756949 is about 614.2487126673.

The spelling of 231756949 in words is "two hundred thirty-one million, seven hundred fifty-six thousand, nine hundred forty-nine".