31820681245 has 4 divisors (see below), whose sum is σ = 38184817500. Its totient is φ = 25456544992.

The previous prime is 31820681203. The next prime is 31820681287. The reversal of 31820681245 is 54218602813.

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

It is an interprime number because it is at equal distance from previous prime (31820681203) and next prime (31820681287).

It can be written as a sum of positive squares in 2 ways, for example, as 16803159129 + 15017522116 = 129627^2 + 122546^2 .

It is a cyclic number.

It is not a de Polignac number, because 31820681245 - 2⁷ = 31820681117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31820681198 and 31820681207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3182068120 + ... + 3182068129.

It is an arithmetic number, because the mean of its divisors is an integer number (9546204375).

Almost surely, 2^31820681245 is an apocalyptic number.

It is an amenable number.

31820681245 is a deficient number, since it is larger than the sum of its proper divisors (6364136255).

31820681245 is an equidigital number, since it uses as much as digits as its factorization.

31820681245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6364136254.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 31820681245 in words is "thirty-one billion, eight hundred twenty million, six hundred eighty-one thousand, two hundred forty-five".