1602721 has 2 divisors, whose sum is σ = 1602722. Its totient is φ = 1602720.

The previous prime is 1602719. The next prime is 1602737. The reversal of 1602721 is 1272061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1535121 + 67600 = 1239^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1602721 - 2¹ = 1602719 is a prime.

Together with 1602719, it forms a pair of twin primes.

It is a Chen prime.

1602721 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1602751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801360 + 801361.

It is an arithmetic number, because the mean of its divisors is an integer number (801361).

2^1602721 is an apocalyptic number.

It is an amenable number.

1602721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1602721 is an equidigital number, since it uses as much as digits as its factorization.

1602721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1602721 is about 1265.9861768598. The cubic root of 1602721 is about 117.0269740812.

Adding to 1602721 its reverse (1272061), we get a palindrome (2874782).

The spelling of 1602721 in words is "one million, six hundred two thousand, seven hundred twenty-one".