31213031254004 has 6 divisors (see below), whose sum is σ = 54622804694514. Its totient is φ = 15606515627000.

The previous prime is 31213031253961. The next prime is 31213031254007. The reversal of 31213031254004 is 40045213031213.

It can be written as a sum of positive squares in only one way, i.e., 27776568041104 + 3436463212900 = 5270348^2 + 1853770^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213031254007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3901628906747 + ... + 3901628906754.

It is an arithmetic number, because the mean of its divisors is an integer number (9103800782419).

Almost surely, 2^{31213031254004} is an apocalyptic number.

It is an amenable number.

31213031254004 is a deficient number, since it is larger than the sum of its proper divisors (23409773440510).

31213031254004 is a wasteful number, since it uses less digits than its factorization.

31213031254004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7803257813505 (or 7803257813503 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 31213031254004 its reverse (40045213031213), we get a palindrome (71258244285217).

The spelling of 31213031254004 in words is "thirty-one trillion, two hundred thirteen billion, thirty-one million, two hundred fifty-four thousand, four".