1975881617 has 2 divisors, whose sum is σ = 1975881618. Its totient is φ = 1975881616.

The previous prime is 1975881577. The next prime is 1975881619. The reversal of 1975881617 is 7161885791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1415565376 + 560316241 = 37624^2 + 23671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1975881617 - 2²⁰ = 1974833041 is a prime.

Together with 1975881619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1975881619) 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 as a sum of consecutive naturals, namely, 987940808 + 987940809.

It is an arithmetic number, because the mean of its divisors is an integer number (987940809).

Almost surely, 2^1975881617 is an apocalyptic number.

It is an amenable number.

1975881617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975881617 is an equidigital number, since it uses as much as digits as its factorization.

1975881617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 53.

The square root of 1975881617 is about 44450.8899460967. The cubic root of 1975881617 is about 1254.8360112284.

The spelling of 1975881617 in words is "one billion, nine hundred seventy-five million, eight hundred eighty-one thousand, six hundred seventeen".