31321656073 has 4 divisors (see below), whose sum is σ = 31332096148. Its totient is φ = 31311216000.

The previous prime is 31321656049. The next prime is 31321656083. The reversal of 31321656073 is 37065612313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37065612313 = 1889 ⋅19621817.

It can be written as a sum of positive squares in 2 ways, for example, as 9378566649 + 21943089424 = 96843^2 + 148132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321656073 is a prime.

It is a super-2 number, since 2×31321656073² (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 (31321656083) 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, 5215536 + ... + 5221537.

It is an arithmetic number, because the mean of its divisors is an integer number (7833024037).

Almost surely, 2^31321656073 is an apocalyptic number.

It is an amenable number.

31321656073 is a deficient number, since it is larger than the sum of its proper divisors (10440075).

31321656073 is a wasteful number, since it uses less digits than its factorization.

31321656073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440074.

The product of its (nonzero) digits is 68040, while the sum is 37.

The spelling of 31321656073 in words is "thirty-one billion, three hundred twenty-one million, six hundred fifty-six thousand, seventy-three".