1975549517 has 2 divisors, whose sum is σ = 1975549518. Its totient is φ = 1975549516.

The previous prime is 1975549489. The next prime is 1975549519. The reversal of 1975549517 is 7159455791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1875669481 + 99880036 = 43309^2 + 9994^2 .

It is an emirp because it is prime and its reverse (7159455791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1975549517 - 2¹² = 1975545421 is a prime.

Together with 1975549519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1975549519) 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, 987774758 + 987774759.

It is an arithmetic number, because the mean of its divisors is an integer number (987774759).

Almost surely, 2^1975549517 is an apocalyptic number.

It is an amenable number.

1975549517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975549517 is an equidigital number, since it uses as much as digits as its factorization.

1975549517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1984500, while the sum is 53.

The square root of 1975549517 is about 44447.1542058656. The cubic root of 1975549517 is about 1254.7657043190.

The spelling of 1975549517 in words is "one billion, nine hundred seventy-five million, five hundred forty-nine thousand, five hundred seventeen".