31121203309 has 8 divisors (see below), whose sum is σ = 35765789760. Its totient is φ = 26526291936.

The previous prime is 31121203301. The next prime is 31121203313. The reversal of 31121203309 is 90330212113.

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

It is a cyclic number.

It is not a de Polignac number, because 31121203309 - 2³ = 31121203301 is a prime.

It is a super-2 number, since 2×31121203309² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121203301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12417424 + ... + 12419929.

It is an arithmetic number, because the mean of its divisors is an integer number (4470723720).

Almost surely, 2^31121203309 is an apocalyptic number.

It is an amenable number.

31121203309 is a deficient number, since it is larger than the sum of its proper divisors (4644586451).

31121203309 is a wasteful number, since it uses less digits than its factorization.

31121203309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24837539.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 31121203309 in words is "thirty-one billion, one hundred twenty-one million, two hundred three thousand, three hundred nine".