1997242367 has 2 divisors, whose sum is σ = 1997242368. Its totient is φ = 1997242366.

The previous prime is 1997242327. The next prime is 1997242369. The reversal of 1997242367 is 7632427991.

It is a strong prime.

It is an emirp because it is prime and its reverse (7632427991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997242367 - 2²⁰ = 1996193791 is a prime.

Together with 1997242369, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997242369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998621183 + 998621184.

It is an arithmetic number, because the mean of its divisors is an integer number (998621184).

Almost surely, 2^1997242367 is an apocalyptic number.

1997242367 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997242367 is an equidigital number, since it uses as much as digits as its factorization.

1997242367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 50.

The square root of 1997242367 is about 44690.5176407703. The cubic root of 1997242367 is about 1259.3417169045.

The spelling of 1997242367 in words is "one billion, nine hundred ninety-seven million, two hundred forty-two thousand, three hundred sixty-seven".