165461987 has 2 divisors, whose sum is σ = 165461988. Its totient is φ = 165461986.

The previous prime is 165461957. The next prime is 165462001. The reversal of 165461987 is 789164561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165461987 - 2¹⁸ = 165199843 is a prime.

It is not a weakly prime, because it can be changed into another prime (165461957) 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, 82730993 + 82730994.

It is an arithmetic number, because the mean of its divisors is an integer number (82730994).

Almost surely, 2^165461987 is an apocalyptic number.

165461987 is a deficient number, since it is larger than the sum of its proper divisors (1).

165461987 is an equidigital number, since it uses as much as digits as its factorization.

165461987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 165461987 is about 12863.2028282228. The cubic root of 165461987 is about 548.9920790980.

The spelling of 165461987 in words is "one hundred sixty-five million, four hundred sixty-one thousand, nine hundred eighty-seven".