1231320572 has 12 divisors (see below), whose sum is σ = 2156259000. Its totient is φ = 615246576.

The previous prime is 1231320551. The next prime is 1231320577. The reversal of 1231320572 is 2750231321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231320577) 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 3 ways as a sum of consecutive naturals, for example, 96683 + ... + 108674.

It is an arithmetic number, because the mean of its divisors is an integer number (179688250).

Almost surely, 2^1231320572 is an apocalyptic number.

It is an amenable number.

1231320572 is a deficient number, since it is larger than the sum of its proper divisors (924938428).

1231320572 is a wasteful number, since it uses less digits than its factorization.

1231320572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206860 (or 206858 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 1231320572 is about 35090.1777139985. The cubic root of 1231320572 is about 1071.8245784372.

Adding to 1231320572 its reverse (2750231321), we get a palindrome (3981551893).

The spelling of 1231320572 in words is "one billion, two hundred thirty-one million, three hundred twenty thousand, five hundred seventy-two".