31213440993 has 8 divisors (see below), whose sum is σ = 47563338688. Its totient is φ = 17836251984.

The previous prime is 31213440991. The next prime is 31213441003. The reversal of 31213440993 is 39904431213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31213440993 - 2¹ = 31213440991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213440991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 743177146 + ... + 743177187.

It is an arithmetic number, because the mean of its divisors is an integer number (5945417336).

Almost surely, 2^31213440993 is an apocalyptic number.

It is an amenable number.

31213440993 is a deficient number, since it is larger than the sum of its proper divisors (16349897695).

31213440993 is a wasteful number, since it uses less digits than its factorization.

31213440993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486354343.

The product of its (nonzero) digits is 69984, while the sum is 39.

The spelling of 31213440993 in words is "thirty-one billion, two hundred thirteen million, four hundred forty thousand, nine hundred ninety-three".