31120001993 has 4 divisors (see below), whose sum is σ = 32193105540. Its totient is φ = 30046898448.

The previous prime is 31120001951. The next prime is 31120002007. The reversal of 31120001993 is 39910002113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6647467024 + 24472534969 = 81532^2 + 156437^2 .

It is a cyclic number.

It is not a de Polignac number, because 31120001993 - 2⁶ = 31120001929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 1073103517 = 31120001993 / (3 + 1 + 1 + 2 + 0 + 0 + 0 + 1 + 9 + 9 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31120007993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536551730 + ... + 536551787.

It is an arithmetic number, because the mean of its divisors is an integer number (8048276385).

Almost surely, 2^31120001993 is an apocalyptic number.

It is an amenable number.

31120001993 is a deficient number, since it is larger than the sum of its proper divisors (1073103547).

31120001993 is a wasteful number, since it uses less digits than its factorization.

31120001993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073103546.

The product of its (nonzero) digits is 1458, while the sum is 29.

The spelling of 31120001993 in words is "thirty-one billion, one hundred twenty million, one thousand, nine hundred ninety-three".