31001220200 has 48 divisors (see below), whose sum is σ = 72443806380. Its totient is φ = 12337525760.

The previous prime is 31001220181. The next prime is 31001220203. The reversal of 31001220200 is 202210013.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 29495314564 + 1505905636 = 171742^2 + 38806^2 .

It is a super-2 number, since 2×31001220200² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31001220203) 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 11 ways as a sum of consecutive naturals, for example, 354017 + ... + 432816.

Almost surely, 2^31001220200 is an apocalyptic number.

It is an amenable number.

31001220200 is an abundant number, since it is smaller than the sum of its proper divisors (41442586180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31001220200 is a wasteful number, since it uses less digits than its factorization.

31001220200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787046 (or 787037 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 31001220200 its reverse (202210013), we get a palindrome (31203430213).

The spelling of 31001220200 in words is "thirty-one billion, one million, two hundred twenty thousand, two hundred".