31620371245 has 8 divisors (see below), whose sum is σ = 37984774680. Its totient is φ = 25269410880.

The previous prime is 31620371243. The next prime is 31620371257. The reversal of 31620371245 is 54217302613.

It can be written as a sum of positive squares in 4 ways, for example, as 9903633289 + 21716737956 = 99517^2 + 147366^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31620371245 - 2¹ = 31620371243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31620371245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31620371243) 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 7 ways as a sum of consecutive naturals, for example, 3355590 + ... + 3364999.

It is an arithmetic number, because the mean of its divisors is an integer number (4748096835).

Almost surely, 2^31620371245 is an apocalyptic number.

It is an amenable number.

31620371245 is a deficient number, since it is larger than the sum of its proper divisors (6364403435).

31620371245 is an equidigital number, since it uses as much as digits as its factorization.

31620371245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6721535.

The product of its (nonzero) digits is 30240, while the sum is 34.

Adding to 31620371245 its reverse (54217302613), we get a palindrome (85837673858).

The spelling of 31620371245 in words is "thirty-one billion, six hundred twenty million, three hundred seventy-one thousand, two hundred forty-five".