997577 has 16 divisors (see below), whose sum is σ = 1233792. Its totient is φ = 787200.

The previous prime is 997573. The next prime is 997583. The reversal of 997577 is 775799.

It is a cyclic number.

It is not a de Polignac number, because 997577 - 2² = 997573 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9827 + ... + 9927.

It is an arithmetic number, because the mean of its divisors is an integer number (77112).

2⁹⁹⁷⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

997577 is a deficient number, since it is larger than the sum of its proper divisors (236215).

997577 is a wasteful number, since it uses less digits than its factorization.

997577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208.

The product of its digits is 138915, while the sum is 44.

The square root of 997577 is about 998.7877652434. The cubic root of 997577 is about 99.9191680128.

The spelling of 997577 in words is "nine hundred ninety-seven thousand, five hundred seventy-seven".