997530923 has 2 divisors, whose sum is σ = 997530924. Its totient is φ = 997530922.

The previous prime is 997530889. The next prime is 997530929. The reversal of 997530923 is 329035799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997530923 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (997530929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498765461 + 498765462.

It is an arithmetic number, because the mean of its divisors is an integer number (498765462).

Almost surely, 2^997530923 is an apocalyptic number.

997530923 is a deficient number, since it is larger than the sum of its proper divisors (1).

997530923 is an equidigital number, since it uses as much as digits as its factorization.

997530923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 459270, while the sum is 47.

The square root of 997530923 is about 31583.7129387917. The cubic root of 997530923 is about 999.1762960314.

The spelling of 997530923 in words is "nine hundred ninety-seven million, five hundred thirty thousand, nine hundred twenty-three".