31243311320240 has 40 divisors (see below), whose sum is σ = 72846479901888. Its totient is φ = 12461921331200.

The previous prime is 31243311320233. The next prime is 31243311320267. The reversal of 31243311320240 is 4202311334213.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×31243311320240² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 553146536 + ... + 553203015.

Almost surely, 2^{31243311320240} is an apocalyptic number.

It is an amenable number.

31243311320240 is an abundant number, since it is smaller than the sum of its proper divisors (41603168581648).

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

31243311320240 is a wasteful number, since it uses less digits than its factorization.

31243311320240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106349917 (or 1106349911 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 31243311320240 its reverse (4202311334213), we get a palindrome (35445622654453).

The spelling of 31243311320240 in words is "thirty-one trillion, two hundred forty-three billion, three hundred eleven million, three hundred twenty thousand, two hundred forty".