164881987 has 2 divisors, whose sum is σ = 164881988. Its totient is φ = 164881986.

The previous prime is 164881979. The next prime is 164881991. The reversal of 164881987 is 789188461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 164881987 - 2³ = 164881979 is a prime.

It is not a weakly prime, because it can be changed into another prime (164881957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82440993 + 82440994.

It is an arithmetic number, because the mean of its divisors is an integer number (82440994).

Almost surely, 2^164881987 is an apocalyptic number.

164881987 is a deficient number, since it is larger than the sum of its proper divisors (1).

164881987 is an equidigital number, since it uses as much as digits as its factorization.

164881987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 52.

The square root of 164881987 is about 12840.6381071970. The cubic root of 164881987 is about 548.3498607272.

The spelling of 164881987 in words is "one hundred sixty-four million, eight hundred eighty-one thousand, nine hundred eighty-seven".