1002321997 has 2 divisors, whose sum is σ = 1002321998. Its totient is φ = 1002321996.

The previous prime is 1002321979. The next prime is 1002322019. The reversal of 1002321997 is 7991232001.

It is a happy number.

Together with previous prime (1002321979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923005161 + 79316836 = 30381^2 + 8906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002321997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002321917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501160998 + 501160999.

It is an arithmetic number, because the mean of its divisors is an integer number (501160999).

Almost surely, 2^1002321997 is an apocalyptic number.

It is an amenable number.

1002321997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002321997 is an equidigital number, since it uses as much as digits as its factorization.

1002321997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 1002321997 is about 31659.4693101448. The cubic root of 1002321997 is about 1000.7734006972.

Adding to 1002321997 its reverse (7991232001), we get a palindrome (8993553998).

The spelling of 1002321997 in words is "one billion, two million, three hundred twenty-one thousand, nine hundred ninety-seven".