31818027745 has 12 divisors (see below), whose sum is σ = 44415369684. Its totient is φ = 21818076000.

The previous prime is 31818027743. The next prime is 31818027751. The reversal of 31818027745 is 54772081813.

It can be written as a sum of positive squares in 2 ways, for example, as 3784218256 + 28033809489 = 61516^2 + 167433^2 .

It is not a de Polignac number, because 31818027745 - 2¹ = 31818027743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31818027695 and 31818027704.

It is not an unprimeable number, because it can be changed into a prime (31818027743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64934506 + ... + 64934995.

It is an arithmetic number, because the mean of its divisors is an integer number (3701280807).

Almost surely, 2^31818027745 is an apocalyptic number.

31818027745 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31818027745 is a deficient number, since it is larger than the sum of its proper divisors (12597341939).

31818027745 is a wasteful number, since it uses less digits than its factorization.

31818027745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129869520 (or 129869513 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The spelling of 31818027745 in words is "thirty-one billion, eight hundred eighteen million, twenty-seven thousand, seven hundred forty-five".