975430991 has 2 divisors, whose sum is σ = 975430992. Its totient is φ = 975430990.

The previous prime is 975430843. The next prime is 975431021. The reversal of 975430991 is 199034579.

It is a strong prime.

It is an emirp because it is prime and its reverse (199034579) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 975430991 - 2²² = 971236687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (975430591) 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, 487715495 + 487715496.

It is an arithmetic number, because the mean of its divisors is an integer number (487715496).

Almost surely, 2^975430991 is an apocalyptic number.

975430991 is a deficient number, since it is larger than the sum of its proper divisors (1).

975430991 is an equidigital number, since it uses as much as digits as its factorization.

975430991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 975430991 is about 31231.8906087992. The cubic root of 975430991 is about 991.7423288957.

The spelling of 975430991 in words is "nine hundred seventy-five million, four hundred thirty thousand, nine hundred ninety-one".