975991 has 2 divisors, whose sum is σ = 975992. Its totient is φ = 975990.

The previous prime is 975977. The next prime is 976009. The reversal of 975991 is 199579.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-975991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (975901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487995 + 487996.

It is an arithmetic number, because the mean of its divisors is an integer number (487996).

2⁹⁷⁵⁹⁹¹ is an apocalyptic number.

975991 is a deficient number, since it is larger than the sum of its proper divisors (1).

975991 is an equidigital number, since it uses as much as digits as its factorization.

975991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25515, while the sum is 40.

The square root of 975991 is about 987.9225678159. The cubic root of 975991 is about 99.1932083778.

The spelling of 975991 in words is "nine hundred seventy-five thousand, nine hundred ninety-one".