31023212309 has 8 divisors (see below), whose sum is σ = 31687279488. Its totient is φ = 30359311840.

The previous prime is 31023212281. The next prime is 31023212321. The reversal of 31023212309 is 90321232013.

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-31023212309 is a prime.

It is a super-2 number, since 2×31023212309² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023212329) 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, 379529 + ... + 453969.

It is an arithmetic number, because the mean of its divisors is an integer number (3960909936).

Almost surely, 2^31023212309 is an apocalyptic number.

It is an amenable number.

31023212309 is a deficient number, since it is larger than the sum of its proper divisors (664067179).

31023212309 is an equidigital number, since it uses as much as digits as its factorization.

31023212309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83355.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 31023212309 in words is "thirty-one billion, twenty-three million, two hundred twelve thousand, three hundred nine".