31000143330 has 96 divisors (see below), whose sum is σ = 86854832064. Its totient is φ = 7626019968.

The previous prime is 31000143287. The next prime is 31000143347. The reversal of 31000143330 is 3334100013.

It is a super-2 number, since 2×31000143330² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2083377 + ... + 2098203.

It is an arithmetic number, because the mean of its divisors is an integer number (904737834).

Almost surely, 2^31000143330 is an apocalyptic number.

31000143330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31000143330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43427416032).

31000143330 is an abundant number, since it is smaller than the sum of its proper divisors (55854688734).

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

31000143330 is a wasteful number, since it uses less digits than its factorization.

31000143330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16640 (or 16637 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 31000143330 its reverse (3334100013), we get a palindrome (34334243343).

The spelling of 31000143330 in words is "thirty-one billion, one hundred forty-three thousand, three hundred thirty".