1975357897 has 2 divisors, whose sum is σ = 1975357898. Its totient is φ = 1975357896.

The previous prime is 1975357883. The next prime is 1975357931. The reversal of 1975357897 is 7987535791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1809566521 + 165791376 = 42539^2 + 12876^2 .

It is an emirp because it is prime and its reverse (7987535791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1975357897 - 2¹¹ = 1975355849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1975357807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987678948 + 987678949.

It is an arithmetic number, because the mean of its divisors is an integer number (987678949).

Almost surely, 2^1975357897 is an apocalyptic number.

It is an amenable number.

1975357897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975357897 is an equidigital number, since it uses as much as digits as its factorization.

1975357897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16669800, while the sum is 61.

The square root of 1975357897 is about 44444.9985600180. The cubic root of 1975357897 is about 1254.7251340074.

The spelling of 1975357897 in words is "one billion, nine hundred seventy-five million, three hundred fifty-seven thousand, eight hundred ninety-seven".