997113911 has 2 divisors, whose sum is σ = 997113912. Its totient is φ = 997113910.

The previous prime is 997113841. The next prime is 997113913. The reversal of 997113911 is 119311799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997113911 - 2²² = 992919607 is a prime.

Together with 997113913, 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 (997113913) 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, 498556955 + 498556956.

It is an arithmetic number, because the mean of its divisors is an integer number (498556956).

Almost surely, 2^997113911 is an apocalyptic number.

997113911 is a deficient number, since it is larger than the sum of its proper divisors (1).

997113911 is an equidigital number, since it uses as much as digits as its factorization.

997113911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309, while the sum is 41.

The square root of 997113911 is about 31577.1105549574. The cubic root of 997113911 is about 999.0370433455.

The spelling of 997113911 in words is "nine hundred ninety-seven million, one hundred thirteen thousand, nine hundred eleven".