1997369849 has 2 divisors, whose sum is σ = 1997369850. Its totient is φ = 1997369848.

The previous prime is 1997369837. The next prime is 1997369917. The reversal of 1997369849 is 9489637991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1921244224 + 76125625 = 43832^2 + 8725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997369849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1997369149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998684924 + 998684925.

It is an arithmetic number, because the mean of its divisors is an integer number (998684925).

Almost surely, 2^1997369849 is an apocalyptic number.

It is an amenable number.

1997369849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997369849 is an equidigital number, since it uses as much as digits as its factorization.

1997369849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26453952, while the sum is 65.

The square root of 1997369849 is about 44691.9438937265. The cubic root of 1997369849 is about 1259.3685105122.

The spelling of 1997369849 in words is "one billion, nine hundred ninety-seven million, three hundred sixty-nine thousand, eight hundred forty-nine".