997867291 has 2 divisors, whose sum is σ = 997867292. Its totient is φ = 997867290.

The previous prime is 997867279. The next prime is 997867301. The reversal of 997867291 is 192768799.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (192768799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997867291 - 2¹³ = 997859099 is a prime.

It is not a weakly prime, because it can be changed into another prime (997867201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498933645 + 498933646.

It is an arithmetic number, because the mean of its divisors is an integer number (498933646).

Almost surely, 2^997867291 is an apocalyptic number.

997867291 is a deficient number, since it is larger than the sum of its proper divisors (1).

997867291 is an equidigital number, since it uses as much as digits as its factorization.

997867291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 58.

The square root of 997867291 is about 31589.0375130361. The cubic root of 997867291 is about 999.2885910173.

The spelling of 997867291 in words is "nine hundred ninety-seven million, eight hundred sixty-seven thousand, two hundred ninety-one".