1997957603 has 2 divisors, whose sum is σ = 1997957604. Its totient is φ = 1997957602.

The previous prime is 1997957587. The next prime is 1997957609. The reversal of 1997957603 is 3067597991.

It is a strong prime.

It is an emirp because it is prime and its reverse (3067597991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997957603 - 2⁴ = 1997957587 is a prime.

It is not a weakly prime, because it can be changed into another prime (1997957609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998978801 + 998978802.

It is an arithmetic number, because the mean of its divisors is an integer number (998978802).

Almost surely, 2^1997957603 is an apocalyptic number.

1997957603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997957603 is an equidigital number, since it uses as much as digits as its factorization.

1997957603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3214890, while the sum is 56.

The square root of 1997957603 is about 44698.5190246836. The cubic root of 1997957603 is about 1259.4920273272.

The spelling of 1997957603 in words is "one billion, nine hundred ninety-seven million, nine hundred fifty-seven thousand, six hundred three".