997923097 has 4 divisors (see below), whose sum is σ = 998081316. Its totient is φ = 997764880.

The previous prime is 997923053. The next prime is 997923107. The reversal of 997923097 is 790329799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 371872656 + 626050441 = 19284^2 + 25021^2 .

It is a cyclic number.

It is not a de Polignac number, because 997923097 - 2¹¹ = 997921049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997923197) 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, 69238 + ... + 82399.

It is an arithmetic number, because the mean of its divisors is an integer number (249520329).

Almost surely, 2^997923097 is an apocalyptic number.

It is an amenable number.

997923097 is a deficient number, since it is larger than the sum of its proper divisors (158219).

997923097 is a wasteful number, since it uses less digits than its factorization.

997923097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158218.

The product of its (nonzero) digits is 1928934, while the sum is 55.

The square root of 997923097 is about 31589.9208134493. The cubic root of 997923097 is about 999.3072191655.

The spelling of 997923097 in words is "nine hundred ninety-seven million, nine hundred twenty-three thousand, ninety-seven".