31000402200 has 96 divisors (see below), whose sum is σ = 96224823360. Its totient is φ = 8256144000.

The previous prime is 31000402117. The next prime is 31000402229. The reversal of 31000402200 is 220400013.

It is a super-2 number, since 2×31000402200² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 439375 + ... + 505025.

It is an arithmetic number, because the mean of its divisors is an integer number (1002341910).

Almost surely, 2^31000402200 is an apocalyptic number.

31000402200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31000402200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48112411680).

31000402200 is an abundant number, since it is smaller than the sum of its proper divisors (65224421160).

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

31000402200 is a wasteful number, since it uses less digits than its factorization.

31000402200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66457 (or 66448 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 31000402200 its reverse (220400013), we get a palindrome (31220802213).

The spelling of 31000402200 in words is "thirty-one billion, four hundred two thousand, two hundred".