1997049601 has 2 divisors, whose sum is σ = 1997049602. Its totient is φ = 1997049600.

The previous prime is 1997049583. The next prime is 1997049643. The reversal of 1997049601 is 1069407991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1797675201 + 199374400 = 42399^2 + 14120^2 .

It is an emirp because it is prime and its reverse (1069407991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997049601 - 2⁵ = 1997049569 is a prime.

It is not a weakly prime, because it can be changed into another prime (1997049661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998524800 + 998524801.

It is an arithmetic number, because the mean of its divisors is an integer number (998524801).

Almost surely, 2^1997049601 is an apocalyptic number.

It is an amenable number.

1997049601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997049601 is an equidigital number, since it uses as much as digits as its factorization.

1997049601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 1997049601 is about 44688.3609119869. The cubic root of 1997049601 is about 1259.3012000265.

The spelling of 1997049601 in words is "one billion, nine hundred ninety-seven million, forty-nine thousand, six hundred one".