997572005 has 4 divisors (see below), whose sum is σ = 1197086412. Its totient is φ = 798057600.

The previous prime is 997572001. The next prime is 997572013. The reversal of 997572005 is 500275799.

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 727758529 + 269813476 = 26977^2 + 16426^2 .

It is not a de Polignac number, because 997572005 - 2² = 997572001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997572001) 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, 99757196 + ... + 99757205.

It is an arithmetic number, because the mean of its divisors is an integer number (299271603).

Almost surely, 2^997572005 is an apocalyptic number.

It is an amenable number.

997572005 is a deficient number, since it is larger than the sum of its proper divisors (199514407).

997572005 is a wasteful number, since it uses less digits than its factorization.

997572005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199514406.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 997572005 is about 31584.3632989491. The cubic root of 997572005 is about 999.1900124306.

The spelling of 997572005 in words is "nine hundred ninety-seven million, five hundred seventy-two thousand, five".