7122001 has 2 divisors, whose sum is σ = 7122002. Its totient is φ = 7122000.

The previous prime is 7121999. The next prime is 7122007. The reversal of 7122001 is 1002217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4734976 + 2387025 = 2176^2 + 1545^2 .

It is a cyclic number.

It is not a de Polignac number, because 7122001 - 2¹ = 7121999 is a prime.

Together with 7121999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7122007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3561000 + 3561001.

It is an arithmetic number, because the mean of its divisors is an integer number (3561001).

Almost surely, 2^7122001 is an apocalyptic number.

It is an amenable number.

7122001 is a deficient number, since it is larger than the sum of its proper divisors (1).

7122001 is an equidigital number, since it uses as much as digits as its factorization.

7122001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 7122001 is about 2668.7077397122. The cubic root of 7122001 is about 192.3980547519.

Adding to 7122001 its reverse (1002217), we get a palindrome (8124218).

The spelling of 7122001 in words is "seven million, one hundred twenty-two thousand, one".