997675397 has 4 divisors (see below), whose sum is σ = 1000822956. Its totient is φ = 994527840.

The previous prime is 997675391. The next prime is 997675403. The reversal of 997675397 is 793576799.

It is a Cunningham number, because it is equal to 31586²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793576799 = 3023 ⋅262513.

It is an interprime number because it is at equal distance from previous prime (997675391) and next prime (997675403).

It can be written as a sum of positive squares in 2 ways, for example, as 55860676 + 941814721 = 7474^2 + 30689^2 .

It is a cyclic number.

It is not a de Polignac number, because 997675397 - 2⁴ = 997675381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997675391) 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 in 3 ways as a sum of consecutive naturals, for example, 1573304 + ... + 1573937.

It is an arithmetic number, because the mean of its divisors is an integer number (250205739).

Almost surely, 2^997675397 is an apocalyptic number.

It is an amenable number.

997675397 is a deficient number, since it is larger than the sum of its proper divisors (3147559).

997675397 is a wasteful number, since it uses less digits than its factorization.

997675397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3147558.

The product of its digits is 22504230, while the sum is 62.

The square root of 997675397 is about 31586.0000158298. Note that the first 4 decimals coincide. The cubic root of 997675397 is about 999.2245311368.

The spelling of 997675397 in words is "nine hundred ninety-seven million, six hundred seventy-five thousand, three hundred ninety-seven".