1597643945 has 8 divisors (see below), whose sum is σ = 1917411144. Its totient is φ = 1277956224.

The previous prime is 1597643941. The next prime is 1597643947. The reversal of 1597643945 is 5493467951.

It can be written as a sum of positive squares in 4 ways, for example, as 1721344 + 1595922601 = 1312^2 + 39949^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1597643945 - 2² = 1597643941 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1597643941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41717 + ... + 70253.

It is an arithmetic number, because the mean of its divisors is an integer number (239676393).

Almost surely, 2^1597643945 is an apocalyptic number.

It is an amenable number.

1597643945 is a deficient number, since it is larger than the sum of its proper divisors (319767199).

1597643945 is a wasteful number, since it uses less digits than its factorization.

1597643945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39739.

The product of its digits is 4082400, while the sum is 53.

The square root of 1597643945 is about 39970.5384627228. The cubic root of 1597643945 is about 1169.0327177116.

The spelling of 1597643945 in words is "one billion, five hundred ninety-seven million, six hundred forty-three thousand, nine hundred forty-five".