321049987 has 2 divisors, whose sum is σ = 321049988. Its totient is φ = 321049986.

The previous prime is 321049979. The next prime is 321050003. The reversal of 321049987 is 789940123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321049987 - 2³ = 321049979 is a prime.

It is not a weakly prime, because it can be changed into another prime (321049957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160524993 + 160524994.

It is an arithmetic number, because the mean of its divisors is an integer number (160524994).

Almost surely, 2^321049987 is an apocalyptic number.

321049987 is a deficient number, since it is larger than the sum of its proper divisors (1).

321049987 is an equidigital number, since it uses as much as digits as its factorization.

321049987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 321049987 is about 17917.8678140006. The cubic root of 321049987 is about 684.7376671433.

The spelling of 321049987 in words is "three hundred twenty-one million, forty-nine thousand, nine hundred eighty-seven".