321011987 has 2 divisors, whose sum is σ = 321011988. Its totient is φ = 321011986.

The previous prime is 321011953. The next prime is 321012017. The reversal of 321011987 is 789110123.

It is a strong prime.

It is an emirp because it is prime and its reverse (789110123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321011987 - 2⁶ = 321011923 is a prime.

It is not a weakly prime, because it can be changed into another prime (321011947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160505993 + 160505994.

It is an arithmetic number, because the mean of its divisors is an integer number (160505994).

Almost surely, 2^321011987 is an apocalyptic number.

321011987 is a deficient number, since it is larger than the sum of its proper divisors (1).

321011987 is an equidigital number, since it uses as much as digits as its factorization.

321011987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 321011987 is about 17916.8073885947. The cubic root of 321011987 is about 684.7106505218.

The spelling of 321011987 in words is "three hundred twenty-one million, eleven thousand, nine hundred eighty-seven".