1597057897 has 4 divisors (see below), whose sum is σ = 1623239236. Its totient is φ = 1570876560.

The previous prime is 1597057837. The next prime is 1597057933. The reversal of 1597057897 is 7987507951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7987507951 = 14683 ⋅543997.

It can be written as a sum of positive squares in 2 ways, for example, as 810199296 + 786858601 = 28464^2 + 28051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1597057897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1597057817) 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 3 ways as a sum of consecutive naturals, for example, 13090578 + ... + 13090699.

It is an arithmetic number, because the mean of its divisors is an integer number (405809809).

Almost surely, 2^1597057897 is an apocalyptic number.

It is an amenable number.

1597057897 is a deficient number, since it is larger than the sum of its proper divisors (26181339).

1597057897 is an equidigital number, since it uses as much as digits as its factorization.

1597057897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26181338.

The product of its (nonzero) digits is 5556600, while the sum is 58.

The square root of 1597057897 is about 39963.2067907469. The cubic root of 1597057897 is about 1168.8897586424.

The spelling of 1597057897 in words is "one billion, five hundred ninety-seven million, fifty-seven thousand, eight hundred ninety-seven".