863161987 has 2 divisors, whose sum is σ = 863161988. Its totient is φ = 863161986.

The previous prime is 863161973. The next prime is 863161993. The reversal of 863161987 is 789161368.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 863161987 - 2²⁷ = 728944259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 863161987.

It is not a weakly prime, because it can be changed into another prime (863161907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431580993 + 431580994.

It is an arithmetic number, because the mean of its divisors is an integer number (431580994).

Almost surely, 2^863161987 is an apocalyptic number.

863161987 is a deficient number, since it is larger than the sum of its proper divisors (1).

863161987 is an equidigital number, since it uses as much as digits as its factorization.

863161987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 863161987 is about 29379.6185645764. The cubic root of 863161987 is about 952.1326003861.

The spelling of 863161987 in words is "eight hundred sixty-three million, one hundred sixty-one thousand, nine hundred eighty-seven".