1005071897 has 4 divisors (see below), whose sum is σ = 1005312036. Its totient is φ = 1004831760.

The previous prime is 1005071839. The next prime is 1005071911. The reversal of 1005071897 is 7981705001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7981705001 = 4721 ⋅1690681.

It can be written as a sum of positive squares in 2 ways, for example, as 596385241 + 408686656 = 24421^2 + 20216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005071897 - 2¹⁶ = 1005006361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1005071897.

It is not an unprimeable number, because it can be changed into a prime (1005071497) 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, 113678 + ... + 122199.

It is an arithmetic number, because the mean of its divisors is an integer number (251328009).

Almost surely, 2^1005071897 is an apocalyptic number.

It is an amenable number.

1005071897 is a deficient number, since it is larger than the sum of its proper divisors (240139).

1005071897 is an equidigital number, since it uses as much as digits as its factorization.

1005071897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240138.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 1005071897 is about 31702.8689080342. The cubic root of 1005071897 is about 1001.6877821222.

Adding to 1005071897 its reverse (7981705001), we get a palindrome (8986776898).

The spelling of 1005071897 in words is "one billion, five million, seventy-one thousand, eight hundred ninety-seven".