1231722113 has 8 divisors (see below), whose sum is σ = 1244199528. Its totient is φ = 1219306624.

The previous prime is 1231722103. The next prime is 1231722157. The reversal of 1231722113 is 3112271321.

It can be written as a sum of positive squares in 4 ways, for example, as 56055169 + 1175666944 = 7487^2 + 34288^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231722113 - 2²⁴ = 1214944897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1231722103) 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 in 7 ways as a sum of consecutive naturals, for example, 25031 + ... + 55587.

It is an arithmetic number, because the mean of its divisors is an integer number (155524941).

Almost surely, 2^1231722113 is an apocalyptic number.

It is an amenable number.

1231722113 is a deficient number, since it is larger than the sum of its proper divisors (12477415).

1231722113 is a wasteful number, since it uses less digits than its factorization.

1231722113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30963.

The product of its digits is 504, while the sum is 23.

The square root of 1231722113 is about 35095.8988059859. The cubic root of 1231722113 is about 1071.9410752423.

Adding to 1231722113 its reverse (3112271321), we get a palindrome (4343993434).

The spelling of 1231722113 in words is "one billion, two hundred thirty-one million, seven hundred twenty-two thousand, one hundred thirteen".