31321225473 has 4 divisors (see below), whose sum is σ = 41761633968. Its totient is φ = 20880816980.

The previous prime is 31321225417. The next prime is 31321225501. The reversal of 31321225473 is 37452212313.

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.

It is a cyclic number.

It is not a de Polignac number, because 31321225473 - 2¹³ = 31321217281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31321225073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5220204243 + ... + 5220204248.

It is an arithmetic number, because the mean of its divisors is an integer number (10440408492).

Almost surely, 2^31321225473 is an apocalyptic number.

It is an amenable number.

31321225473 is a deficient number, since it is larger than the sum of its proper divisors (10440408495).

31321225473 is a wasteful number, since it uses less digits than its factorization.

31321225473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10440408494.

The product of its digits is 30240, while the sum is 33.

Adding to 31321225473 its reverse (37452212313), we get a palindrome (68773437786).

The spelling of 31321225473 in words is "thirty-one billion, three hundred twenty-one million, two hundred twenty-five thousand, four hundred seventy-three".