1011966509 has 2 divisors, whose sum is σ = 1011966510. Its totient is φ = 1011966508.

The previous prime is 1011966499. The next prime is 1011966533. The reversal of 1011966509 is 9056691101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1010922025 + 1044484 = 31795^2 + 1022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011966509 - 2⁴ = 1011966493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011966569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505983254 + 505983255.

It is an arithmetic number, because the mean of its divisors is an integer number (505983255).

Almost surely, 2^1011966509 is an apocalyptic number.

It is an amenable number.

1011966509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011966509 is an equidigital number, since it uses as much as digits as its factorization.

1011966509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 1011966509 is about 31811.4210465361. The cubic root of 1011966509 is about 1003.9730304576.

The spelling of 1011966509 in words is "one billion, eleven million, nine hundred sixty-six thousand, five hundred nine".