31000120215340 has 12 divisors (see below), whose sum is σ = 65100252452256. Its totient is φ = 12400048086128.

The previous prime is 31000120215269. The next prime is 31000120215343. The reversal of 31000120215340 is 4351202100013.

It is a happy number.

It is a super-2 number, since 2×31000120215340² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31000120215343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775003005364 + ... + 775003005403.

It is an arithmetic number, because the mean of its divisors is an integer number (5425021037688).

Almost surely, 2^{31000120215340} is an apocalyptic number.

It is an amenable number.

31000120215340 is an abundant number, since it is smaller than the sum of its proper divisors (34100132236916).

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

31000120215340 is a wasteful number, since it uses less digits than its factorization.

31000120215340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550006010776 (or 1550006010774 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 31000120215340 its reverse (4351202100013), we get a palindrome (35351322315353).

The spelling of 31000120215340 in words is "thirty-one trillion, one hundred twenty million, two hundred fifteen thousand, three hundred forty".