1231722112 has 32 divisors (see below), whose sum is σ = 2455481700. Its totient is φ = 615444480.

The previous prime is 1231722103. The next prime is 1231722157. The reversal of 1231722112 is 2112271321.

It can be written as a sum of positive squares in 2 ways, for example, as 1229484096 + 2238016 = 35064^2 + 1496^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1231722112² = 3034278722379481088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288312 + ... + 292552.

Almost surely, 2^1231722112 is an apocalyptic number.

It is an amenable number.

1231722112 is a deficient number, since it is larger than the sum of its proper divisors (1223759588).

1231722112 is an equidigital number, since it uses as much as digits as its factorization.

1231722112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6524 (or 6512 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 1231722112 is about 35095.8987917392. The cubic root of 1231722112 is about 1071.9410749522.

Adding to 1231722112 its reverse (2112271321), we get a palindrome (3343993433).

The spelling of 1231722112 in words is "one billion, two hundred thirty-one million, seven hundred twenty-two thousand, one hundred twelve".