31082612321 has 4 divisors (see below), whose sum is σ = 32434030272. Its totient is φ = 29731194372.

The previous prime is 31082612317. The next prime is 31082612347. The reversal of 31082612321 is 12321628013.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12321628013 = 317 ⋅38869489.

It is a cyclic number.

It is not a de Polignac number, because 31082612321 - 2² = 31082612317 is a prime.

It is a super-2 number, since 2×31082612321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31082612381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675708941 + ... + 675708986.

It is an arithmetic number, because the mean of its divisors is an integer number (8108507568).

Almost surely, 2^31082612321 is an apocalyptic number.

It is an amenable number.

31082612321 is a deficient number, since it is larger than the sum of its proper divisors (1351417951).

31082612321 is a wasteful number, since it uses less digits than its factorization.

31082612321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351417950.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 31082612321 in words is "thirty-one billion, eighty-two million, six hundred twelve thousand, three hundred twenty-one".