165812987 has 2 divisors, whose sum is σ = 165812988. Its totient is φ = 165812986.

The previous prime is 165812921. The next prime is 165813023. The reversal of 165812987 is 789218561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165812987 - 2¹² = 165808891 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (185812987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82906493 + 82906494.

It is an arithmetic number, because the mean of its divisors is an integer number (82906494).

Almost surely, 2^165812987 is an apocalyptic number.

165812987 is a deficient number, since it is larger than the sum of its proper divisors (1).

165812987 is an equidigital number, since it uses as much as digits as its factorization.

165812987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 47.

The square root of 165812987 is about 12876.8391696099. The cubic root of 165812987 is about 549.3800032893.

The spelling of 165812987 in words is "one hundred sixty-five million, eight hundred twelve thousand, nine hundred eighty-seven".