31320407445 has 16 divisors (see below), whose sum is σ = 50118453312. Its totient is φ = 16702283520.

The previous prime is 31320407441. The next prime is 31320407449. The reversal of 31320407445 is 54470402313.

It is an interprime number because it is at equal distance from previous prime (31320407441) and next prime (31320407449).

It is not a de Polignac number, because 31320407445 - 2² = 31320407441 is a prime.

It is a super-2 number, since 2×31320407445² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320407441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18189 + ... + 250941.

It is an arithmetic number, because the mean of its divisors is an integer number (3132403332).

Almost surely, 2^31320407445 is an apocalyptic number.

It is an amenable number.

31320407445 is a deficient number, since it is larger than the sum of its proper divisors (18798045867).

31320407445 is a wasteful number, since it uses less digits than its factorization.

31320407445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241732.

The product of its (nonzero) digits is 40320, while the sum is 33.

Adding to 31320407445 its reverse (54470402313), we get a palindrome (85790809758).

The spelling of 31320407445 in words is "thirty-one billion, three hundred twenty million, four hundred seven thousand, four hundred forty-five".