999143689 has 2 divisors, whose sum is σ = 999143690. Its totient is φ = 999143688.

The previous prime is 999143653. The next prime is 999143707. The reversal of 999143689 is 986341999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 917060089 + 82083600 = 30283^2 + 9060^2 .

It is a cyclic number.

It is not a de Polignac number, because 999143689 - 2¹¹ = 999141641 is a prime.

It is a super-2 number, since 2×999143689² = 1996576222537057442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999143389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499571844 + 499571845.

It is an arithmetic number, because the mean of its divisors is an integer number (499571845).

Almost surely, 2^999143689 is an apocalyptic number.

It is an amenable number.

999143689 is a deficient number, since it is larger than the sum of its proper divisors (1).

999143689 is an equidigital number, since it uses as much as digits as its factorization.

999143689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 58.

The square root of 999143689 is about 31609.2342362165. The cubic root of 999143689 is about 999.7144814869.

The spelling of 999143689 in words is "nine hundred ninety-nine million, one hundred forty-three thousand, six hundred eighty-nine".