1065976991 has 2 divisors, whose sum is σ = 1065976992. Its totient is φ = 1065976990.

The previous prime is 1065976979. The next prime is 1065976997. The reversal of 1065976991 is 1996795601.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1065976991 is a prime.

It is a super-2 number, since 2×1065976991² = 2272613890682828162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1065976997) 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, 532988495 + 532988496.

It is an arithmetic number, because the mean of its divisors is an integer number (532988496).

Almost surely, 2^1065976991 is an apocalyptic number.

1065976991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1065976991 is an equidigital number, since it uses as much as digits as its factorization.

1065976991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 53.

The square root of 1065976991 is about 32649.3030706629. The cubic root of 1065976991 is about 1021.5256519769.

The spelling of 1065976991 in words is "one billion, sixty-five million, nine hundred seventy-six thousand, nine hundred ninety-one".