320872001 has 2 divisors, whose sum is σ = 320872002. Its totient is φ = 320872000.

The previous prime is 320871997. The next prime is 320872003. The reversal of 320872001 is 100278023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165894400 + 154977601 = 12880^2 + 12449^2 .

It is an emirp because it is prime and its reverse (100278023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320872001 - 2² = 320871997 is a prime.

Together with 320872003, 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 (320872003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160436000 + 160436001.

It is an arithmetic number, because the mean of its divisors is an integer number (160436001).

Almost surely, 2^320872001 is an apocalyptic number.

It is an amenable number.

320872001 is a deficient number, since it is larger than the sum of its proper divisors (1).

320872001 is an equidigital number, since it uses as much as digits as its factorization.

320872001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 320872001 is about 17912.9004072484. The cubic root of 320872001 is about 684.6111071557.

The spelling of 320872001 in words is "three hundred twenty million, eight hundred seventy-two thousand, one".