31783626321 has 4 divisors (see below), whose sum is σ = 42378168432. Its totient is φ = 21189084212.

The previous prime is 31783626313. The next prime is 31783626323. The reversal of 31783626321 is 12362638713.

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 31783626321 - 2³ = 31783626313 is a prime.

It is a super-2 number, since 2×31783626321² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31783626323) 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 3 ways as a sum of consecutive naturals, for example, 5297271051 + ... + 5297271056.

It is an arithmetic number, because the mean of its divisors is an integer number (10594542108).

Almost surely, 2^31783626321 is an apocalyptic number.

It is an amenable number.

31783626321 is a deficient number, since it is larger than the sum of its proper divisors (10594542111).

31783626321 is a wasteful number, since it uses less digits than its factorization.

31783626321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10594542110.

The product of its digits is 217728, while the sum is 42.

The spelling of 31783626321 in words is "thirty-one billion, seven hundred eighty-three million, six hundred twenty-six thousand, three hundred twenty-one".