997490969 has 4 divisors (see below), whose sum is σ = 997564260. Its totient is φ = 997417680.

The previous prime is 997490959. The next prime is 997490981. The reversal of 997490969 is 969094799.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 969094799 = 19457 ⋅49807.

It can be written as a sum of positive squares in 2 ways, for example, as 944025625 + 53465344 = 30725^2 + 7312^2 .

It is a cyclic number.

It is not a de Polignac number, because 997490969 - 2⁸ = 997490713 is a prime.

It is a super-2 number, since 2×997490969² = 1989976466473117922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997490939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9554 + ... + 45675.

It is an arithmetic number, because the mean of its divisors is an integer number (249391065).

Almost surely, 2^997490969 is an apocalyptic number.

It is an amenable number.

997490969 is a deficient number, since it is larger than the sum of its proper divisors (73291).

997490969 is a wasteful number, since it uses less digits than its factorization.

997490969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73290.

The product of its (nonzero) digits is 9920232, while the sum is 62.

The square root of 997490969 is about 31583.0804229100. The cubic root of 997490969 is about 999.1629558860.

The spelling of 997490969 in words is "nine hundred ninety-seven million, four hundred ninety thousand, nine hundred sixty-nine".