3121722272 has 24 divisors (see below), whose sum is σ = 6147334116. Its totient is φ = 1560494592.

The previous prime is 3121722251. The next prime is 3121722283. The reversal of 3121722272 is 2722271213.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3051899536 + 69822736 = 55244^2 + 8356^2 .

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, 172268 + ... + 189524.

Almost surely, 2^3121722272 is an apocalyptic number.

3121722272 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

3121722272 is a deficient number, since it is larger than the sum of its proper divisors (3025611844).

3121722272 is a wasteful number, since it uses less digits than its factorization.

3121722272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22920 (or 22912 counting only the distinct ones).

The product of its digits is 4704, while the sum is 29.

The square root of 3121722272 is about 55872.3748555581. The cubic root of 3121722272 is about 1461.4975364337.

Adding to 3121722272 its reverse (2722271213), we get a palindrome (5843993485).

The spelling of 3121722272 in words is "three billion, one hundred twenty-one million, seven hundred twenty-two thousand, two hundred seventy-two".