321400987 has 2 divisors, whose sum is σ = 321400988. Its totient is φ = 321400986.

The previous prime is 321400973. The next prime is 321401021. The reversal of 321400987 is 789004123.

It is an a-pointer prime, because the next prime (321401021) can be obtained adding 321400987 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321400987 - 2¹⁵ = 321368219 is a prime.

It is not a weakly prime, because it can be changed into another prime (321400187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160700493 + 160700494.

It is an arithmetic number, because the mean of its divisors is an integer number (160700494).

Almost surely, 2^321400987 is an apocalyptic number.

321400987 is a deficient number, since it is larger than the sum of its proper divisors (1).

321400987 is an equidigital number, since it uses as much as digits as its factorization.

321400987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 321400987 is about 17927.6598305523. The cubic root of 321400987 is about 684.9871146812.

The spelling of 321400987 in words is "three hundred twenty-one million, four hundred thousand, nine hundred eighty-seven".