320129987 has 2 divisors, whose sum is σ = 320129988. Its totient is φ = 320129986.

The previous prime is 320129977. The next prime is 320129989. The reversal of 320129987 is 789921023.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (789921023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320129987 - 2¹⁸ = 319867843 is a prime.

Together with 320129989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (320129989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160064993 + 160064994.

It is an arithmetic number, because the mean of its divisors is an integer number (160064994).

Almost surely, 2^320129987 is an apocalyptic number.

320129987 is a deficient number, since it is larger than the sum of its proper divisors (1).

320129987 is an equidigital number, since it uses as much as digits as its factorization.

320129987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 320129987 is about 17892.1766982109. The cubic root of 320129987 is about 684.0829805680.

The spelling of 320129987 in words is "three hundred twenty million, one hundred twenty-nine thousand, nine hundred eighty-seven".