31756473145 has 8 divisors (see below), whose sum is σ = 38535945480. Its totient is φ = 25119726720.

The previous prime is 31756473143. The next prime is 31756473157. The reversal of 31756473145 is 54137465713.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 376476409 + 31379996736 = 19403^2 + 177144^2 .

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

It is not a de Polignac number, because 31756473145 - 2¹ = 31756473143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31756473095 and 31756473104.

It is not an unprimeable number, because it can be changed into a prime (31756473143) 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, 35680986 + ... + 35681875.

It is an arithmetic number, because the mean of its divisors is an integer number (4816993185).

Almost surely, 2^31756473145 is an apocalyptic number.

It is an amenable number.

31756473145 is a deficient number, since it is larger than the sum of its proper divisors (6779472335).

31756473145 is an equidigital number, since it uses as much as digits as its factorization.

31756473145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71362955.

The product of its digits is 1058400, while the sum is 46.

The spelling of 31756473145 in words is "thirty-one billion, seven hundred fifty-six million, four hundred seventy-three thousand, one hundred forty-five".