31023020100 has 216 divisors, whose sum is σ = 92994478528. Its totient is φ = 7982841600.

The previous prime is 31023020071. The next prime is 31023020101. The reversal of 31023020100 is 102032013.

It is a happy number.

It is a super-2 number, since 2×31023020100² (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 not an unprimeable number, because it can be changed into a prime (31023020101) 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 71 ways as a sum of consecutive naturals, for example, 63702057 + ... + 63702543.

Almost surely, 2^31023020100 is an apocalyptic number.

31023020100 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 31023020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46497239264).

31023020100 is an abundant number, since it is smaller than the sum of its proper divisors (61971458428).

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

31023020100 is a wasteful number, since it uses less digits than its factorization.

31023020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683 (or 617 counting only the distinct ones).

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

Adding to 31023020100 its reverse (102032013), we get a palindrome (31125052113).

The spelling of 31023020100 in words is "thirty-one billion, twenty-three million, twenty thousand, one hundred".