997691113 has 2 divisors, whose sum is σ = 997691114. Its totient is φ = 997691112.

The previous prime is 997691111. The next prime is 997691131. The reversal of 997691113 is 311196799.

Together with next prime (997691131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 927080704 + 70610409 = 30448^2 + 8403^2 .

It is an emirp because it is prime and its reverse (311196799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997691113 - 2¹ = 997691111 is a prime.

Together with 997691111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (997691111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498845556 + 498845557.

It is an arithmetic number, because the mean of its divisors is an integer number (498845557).

Almost surely, 2^997691113 is an apocalyptic number.

It is an amenable number.

997691113 is a deficient number, since it is larger than the sum of its proper divisors (1).

997691113 is an equidigital number, since it uses as much as digits as its factorization.

997691113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 46.

The square root of 997691113 is about 31586.2487959555. The cubic root of 997691113 is about 999.2297779102.

The spelling of 997691113 in words is "nine hundred ninety-seven million, six hundred ninety-one thousand, one hundred thirteen".