997070905 has 4 divisors (see below), whose sum is σ = 1196485092. Its totient is φ = 797656720.

The previous prime is 997070897. The next prime is 997070909. The reversal of 997070905 is 509070799.

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 459202041 + 537868864 = 21429^2 + 23192^2 .

It is not a de Polignac number, because 997070905 - 2³ = 997070897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997070909) 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, 99707086 + ... + 99707095.

It is an arithmetic number, because the mean of its divisors is an integer number (299121273).

Almost surely, 2^997070905 is an apocalyptic number.

It is an amenable number.

997070905 is a deficient number, since it is larger than the sum of its proper divisors (199414187).

997070905 is a wasteful number, since it uses less digits than its factorization.

997070905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199414186.

The product of its (nonzero) digits is 178605, while the sum is 46.

The square root of 997070905 is about 31576.4295796722. The cubic root of 997070905 is about 999.0226801571.

The spelling of 997070905 in words is "nine hundred ninety-seven million, seventy thousand, nine hundred five".