997599581197 has 2 divisors, whose sum is σ = 997599581198. Its totient is φ = 997599581196.

The previous prime is 997599581149. The next prime is 997599581257. The reversal of 997599581197 is 791185995799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 845463699081 + 152135882116 = 919491^2 + 390046^2 .

It is an emirp because it is prime and its reverse (791185995799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997599581197 - 2¹¹ = 997599579149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997599531197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498799790598 + 498799790599.

It is an arithmetic number, because the mean of its divisors is an integer number (498799790599).

Almost surely, 2^997599581197 is an apocalyptic number.

It is an amenable number.

997599581197 is a deficient number, since it is larger than the sum of its proper divisors (1).

997599581197 is an equidigital number, since it uses as much as digits as its factorization.

997599581197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 578680200, while the sum is 79.

The spelling of 997599581197 in words is "nine hundred ninety-seven billion, five hundred ninety-nine million, five hundred eighty-one thousand, one hundred ninety-seven".