1997564603 has 2 divisors, whose sum is σ = 1997564604. Its totient is φ = 1997564602.

The previous prime is 1997564561. The next prime is 1997564659. The reversal of 1997564603 is 3064657991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1997564603 - 2⁶ = 1997564539 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1997564663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998782301 + 998782302.

It is an arithmetic number, because the mean of its divisors is an integer number (998782302).

Almost surely, 2^1997564603 is an apocalyptic number.

1997564603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997564603 is an equidigital number, since it uses as much as digits as its factorization.

1997564603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 1997564603 is about 44694.1226896781. The cubic root of 1997564603 is about 1259.4094408526.

The spelling of 1997564603 in words is "one billion, nine hundred ninety-seven million, five hundred sixty-four thousand, six hundred three".