3121636873 has 2 divisors, whose sum is σ = 3121636874. Its totient is φ = 3121636872.

The previous prime is 3121636871. The next prime is 3121636913. The reversal of 3121636873 is 3786361213.

It is an a-pointer prime, because the next prime (3121636913) can be obtained adding 3121636873 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2017536889 + 1104099984 = 44917^2 + 33228^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121636873 - 2¹ = 3121636871 is a prime.

Together with 3121636871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3121636871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560818436 + 1560818437.

It is an arithmetic number, because the mean of its divisors is an integer number (1560818437).

Almost surely, 2^3121636873 is an apocalyptic number.

It is an amenable number.

3121636873 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121636873 is an equidigital number, since it uses as much as digits as its factorization.

3121636873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 3121636873 is about 55871.6106175578. The cubic root of 3121636873 is about 1461.4842092214.

The spelling of 3121636873 in words is "three billion, one hundred twenty-one million, six hundred thirty-six thousand, eight hundred seventy-three".