31445004220445 has 4 divisors (see below), whose sum is σ = 37734005064540. Its totient is φ = 25156003376352.

The previous prime is 31445004220417. The next prime is 31445004220471. The reversal of 31445004220445 is 54402240054413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8177781141124 + 23267223079321 = 2859682^2 + 4823611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31445004220445 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31445004220399 and 31445004220408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3144500422040 + ... + 3144500422049.

It is an arithmetic number, because the mean of its divisors is an integer number (9433501266135).

Almost surely, 2^{31445004220445} is an apocalyptic number.

It is an amenable number.

31445004220445 is a deficient number, since it is larger than the sum of its proper divisors (6289000844095).

31445004220445 is an equidigital number, since it uses as much as digits as its factorization.

31445004220445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6289000844094.

The product of its (nonzero) digits is 307200, while the sum is 38.

Adding to 31445004220445 its reverse (54402240054413), we get a palindrome (85847244274858).

The spelling of 31445004220445 in words is "thirty-one trillion, four hundred forty-five billion, four million, two hundred twenty thousand, four hundred forty-five".