1231722747 has 16 divisors (see below), whose sum is σ = 1920816000. Its totient is φ = 777929832.

The previous prime is 1231722731. The next prime is 1231722757. The reversal of 1231722747 is 7472271321.

It is not a de Polignac number, because 1231722747 - 2⁴ = 1231722731 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1231722757) 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 15 ways as a sum of consecutive naturals, for example, 1199997 + ... + 1201022.

It is an arithmetic number, because the mean of its divisors is an integer number (120051000).

Almost surely, 2^1231722747 is an apocalyptic number.

1231722747 is a deficient number, since it is larger than the sum of its proper divisors (689093253).

1231722747 is a wasteful number, since it uses less digits than its factorization.

1231722747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401047 (or 2401041 counting only the distinct ones).

The product of its digits is 32928, while the sum is 36.

The square root of 1231722747 is about 35095.9078383791. The cubic root of 1231722747 is about 1071.9412591611.

The spelling of 1231722747 in words is "one billion, two hundred thirty-one million, seven hundred twenty-two thousand, seven hundred forty-seven".