1143215809 has 2 divisors, whose sum is σ = 1143215810. Its totient is φ = 1143215808.

The previous prime is 1143215783. The next prime is 1143215831. The reversal of 1143215809 is 9085123411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1119906225 + 23309584 = 33465^2 + 4828^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143215809 - 2¹¹ = 1143213761 is a prime.

It is not a weakly prime, because it can be changed into another prime (1143213809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571607904 + 571607905.

It is an arithmetic number, because the mean of its divisors is an integer number (571607905).

Almost surely, 2^1143215809 is an apocalyptic number.

It is an amenable number.

1143215809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143215809 is an equidigital number, since it uses as much as digits as its factorization.

1143215809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1143215809 is about 33811.4745167968. The cubic root of 1143215809 is about 1045.6252781319.

The spelling of 1143215809 in words is "one billion, one hundred forty-three million, two hundred fifteen thousand, eight hundred nine".