997570445 has 4 divisors (see below), whose sum is σ = 1197084540. Its totient is φ = 798056352.

The previous prime is 997570423. The next prime is 997570447. The reversal of 997570445 is 544075799.

997570445 = 22333² + 22334².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544075799 = 1097 ⋅495967.

It can be written as a sum of positive squares in 2 ways, for example, as 498762889 + 498807556 = 22333^2 + 22334^2 .

It is a cyclic number.

It is not a de Polignac number, because 997570445 - 2¹⁰ = 997569421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997570393 and 997570402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997570447) 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, 99757040 + ... + 99757049.

It is an arithmetic number, because the mean of its divisors is an integer number (299271135).

Almost surely, 2^997570445 is an apocalyptic number.

997570445 is the 22334-th centered square number.

It is an amenable number.

997570445 is a deficient number, since it is larger than the sum of its proper divisors (199514095).

997570445 is a wasteful number, since it uses less digits than its factorization.

997570445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199514094.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The square root of 997570445 is about 31584.3386031748. The cubic root of 997570445 is about 999.1894915869.

The spelling of 997570445 in words is "nine hundred ninety-seven million, five hundred seventy thousand, four hundred forty-five".