1065211909 has 2 divisors, whose sum is σ = 1065211910. Its totient is φ = 1065211908.

The previous prime is 1065211859. The next prime is 1065211913. The reversal of 1065211909 is 9091125601.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 945747009 + 119464900 = 30753^2 + 10930^2 .

It is an emirp because it is prime and its reverse (9091125601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1065211909 - 2¹¹ = 1065209861 is a prime.

It is a super-2 number, since 2×1065211909² = 2269352822150848562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1065211919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532605954 + 532605955.

It is an arithmetic number, because the mean of its divisors is an integer number (532605955).

Almost surely, 2^1065211909 is an apocalyptic number.

It is an amenable number.

1065211909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1065211909 is an equidigital number, since it uses as much as digits as its factorization.

1065211909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 1065211909 is about 32637.5843009252. The cubic root of 1065211909 is about 1021.2812008144.

The spelling of 1065211909 in words is "one billion, sixty-five million, two hundred eleven thousand, nine hundred nine".