3121878887 has 2 divisors, whose sum is σ = 3121878888. Its totient is φ = 3121878886.

The previous prime is 3121878883. The next prime is 3121878931. The reversal of 3121878887 is 7888781213.

3121878887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3121878887 - 2² = 3121878883 is a prime.

It is a super-2 number, since 2×3121878887² = 19492255570192717538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121878883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560939443 + 1560939444.

It is an arithmetic number, because the mean of its divisors is an integer number (1560939444).

Almost surely, 2^3121878887 is an apocalyptic number.

3121878887 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121878887 is an equidigital number, since it uses as much as digits as its factorization.

3121878887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1204224, while the sum is 53.

The square root of 3121878887 is about 55873.7763803379. The cubic root of 3121878887 is about 1461.5219768536.

The spelling of 3121878887 in words is "three billion, one hundred twenty-one million, eight hundred seventy-eight thousand, eight hundred eighty-seven".