31421331993 has 16 divisors (see below), whose sum is σ = 44028053696. Its totient is φ = 19907415360.

The previous prime is 31421331989. The next prime is 31421332031. The reversal of 31421331993 is 39913312413.

It is not a de Polignac number, because 31421331993 - 2² = 31421331989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31421331913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3286798 + ... + 3296343.

It is an arithmetic number, because the mean of its divisors is an integer number (2751753356).

Almost surely, 2^31421331993 is an apocalyptic number.

It is an amenable number.

31421331993 is a deficient number, since it is larger than the sum of its proper divisors (12606721703).

31421331993 is a wasteful number, since it uses less digits than its factorization.

31421331993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6583224.

The product of its digits is 52488, while the sum is 39.

The spelling of 31421331993 in words is "thirty-one billion, four hundred twenty-one million, three hundred thirty-one thousand, nine hundred ninety-three".