31012121999 has 8 divisors (see below), whose sum is σ = 31261440000. Its totient is φ = 30762884376.

The previous prime is 31012121953. The next prime is 31012122047. The reversal of 31012121999 is 99912121013.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31012121999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012120999) 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, 936092 + ... + 968654.

It is an arithmetic number, because the mean of its divisors is an integer number (3907680000).

Almost surely, 2^31012121999 is an apocalyptic number.

31012121999 is a deficient number, since it is larger than the sum of its proper divisors (249318001).

31012121999 is a wasteful number, since it uses less digits than its factorization.

31012121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40189.

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 31012121999 in words is "thirty-one billion, twelve million, one hundred twenty-one thousand, nine hundred ninety-nine".