31001312321 has 8 divisors (see below), whose sum is σ = 35856940224. Its totient is φ = 26252401680.

The previous prime is 31001312297. The next prime is 31001312371. The reversal of 31001312321 is 12321310013.

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 31001312321 - 2³⁴ = 13821443137 is a prime.

It is a super-2 number, since 2×31001312321² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31001312321.

It is not an unprimeable number, because it can be changed into a prime (31001312371) 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 7 ways as a sum of consecutive naturals, for example, 26678690 + ... + 26679851.

It is an arithmetic number, because the mean of its divisors is an integer number (4482117528).

Almost surely, 2^31001312321 is an apocalyptic number.

It is an amenable number.

31001312321 is a deficient number, since it is larger than the sum of its proper divisors (4855627903).

31001312321 is an equidigital number, since it uses as much as digits as its factorization.

31001312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53358631.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31001312321 its reverse (12321310013), we get a palindrome (43322622334).

The spelling of 31001312321 in words is "thirty-one billion, one million, three hundred twelve thousand, three hundred twenty-one".