3161861987 has 2 divisors, whose sum is σ = 3161861988. Its totient is φ = 3161861986.

The previous prime is 3161861917. The next prime is 3161862001. The reversal of 3161861987 is 7891681613.

It is a strong prime.

It is an emirp because it is prime and its reverse (7891681613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3161861987 - 2¹² = 3161857891 is a prime.

It is not a weakly prime, because it can be changed into another prime (3161861917) 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 as a sum of consecutive naturals, namely, 1580930993 + 1580930994.

It is an arithmetic number, because the mean of its divisors is an integer number (1580930994).

Almost surely, 2^3161861987 is an apocalyptic number.

3161861987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3161861987 is an equidigital number, since it uses as much as digits as its factorization.

3161861987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 50.

The square root of 3161861987 is about 56230.4364823891. The cubic root of 3161861987 is about 1467.7349520061.

The spelling of 3161861987 in words is "three billion, one hundred sixty-one million, eight hundred sixty-one thousand, nine hundred eighty-seven".