1997269511 has 2 divisors, whose sum is σ = 1997269512. Its totient is φ = 1997269510.

The previous prime is 1997269489. The next prime is 1997269513. The reversal of 1997269511 is 1159627991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1997269511 - 2¹⁴ = 1997253127 is a prime.

Together with 1997269513, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1997269511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997269513) 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, 998634755 + 998634756.

It is an arithmetic number, because the mean of its divisors is an integer number (998634756).

Almost surely, 2^1997269511 is an apocalyptic number.

1997269511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997269511 is an equidigital number, since it uses as much as digits as its factorization.

1997269511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 50.

The square root of 1997269511 is about 44690.8213283220. The cubic root of 1997269511 is about 1259.3474220069.

The spelling of 1997269511 in words is "one billion, nine hundred ninety-seven million, two hundred sixty-nine thousand, five hundred eleven".