231307749 has 12 divisors (see below), whose sum is σ = 336355500. Its totient is φ = 153169344.

The previous prime is 231307717. The next prime is 231307753. The reversal of 231307749 is 947703132.

It can be written as a sum of positive squares in 2 ways, for example, as 104407524 + 126900225 = 10218^2 + 11265^2 .

It is not a de Polignac number, because 231307749 - 2⁵ = 231307717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231303749) 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 in 11 ways as a sum of consecutive naturals, for example, 84904 + ... + 87585.

It is an arithmetic number, because the mean of its divisors is an integer number (28029625).

Almost surely, 2^231307749 is an apocalyptic number.

It is an amenable number.

231307749 is a deficient number, since it is larger than the sum of its proper divisors (105047751).

231307749 is a wasteful number, since it uses less digits than its factorization.

231307749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172644 (or 172641 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 231307749 is about 15208.8049826408. The cubic root of 231307749 is about 613.8516027042.

The spelling of 231307749 in words is "two hundred thirty-one million, three hundred seven thousand, seven hundred forty-nine".