31123000200 has 48 divisors (see below), whose sum is σ = 96481302480. Its totient is φ = 8299466560.

The previous prime is 31123000193. The next prime is 31123000201. The reversal of 31123000200 is 200032113.

It is a happy number.

It is a super-2 number, since 2×31123000200² (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 not an unprimeable number, because it can be changed into a prime (31123000201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25935234 + ... + 25936433.

It is an arithmetic number, because the mean of its divisors is an integer number (2010027135).

Almost surely, 2^31123000200 is an apocalyptic number.

31123000200 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31123000200 is an abundant number, since it is smaller than the sum of its proper divisors (65358302280).

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

31123000200 is a wasteful number, since it uses less digits than its factorization.

31123000200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51871686 (or 51871677 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31123000200 its reverse (200032113), we get a palindrome (31323032313).

The spelling of 31123000200 in words is "thirty-one billion, one hundred twenty-three million, two hundred", and thus it is an aban number.