999143779 has 2 divisors, whose sum is σ = 999143780. Its totient is φ = 999143778.

The previous prime is 999143749. The next prime is 999143807. The reversal of 999143779 is 977341999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999143779 - 2¹³ = 999135587 is a prime.

It is a super-2 number, since 2×999143779² = 1996576582228801682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999143749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499571889 + 499571890.

It is an arithmetic number, because the mean of its divisors is an integer number (499571890).

Almost surely, 2^999143779 is an apocalyptic number.

999143779 is a deficient number, since it is larger than the sum of its proper divisors (1).

999143779 is an equidigital number, since it uses as much as digits as its factorization.

999143779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3857868, while the sum is 58.

The square root of 999143779 is about 31609.2356598511. The cubic root of 999143779 is about 999.7145115041.

The spelling of 999143779 in words is "nine hundred ninety-nine million, one hundred forty-three thousand, seven hundred seventy-nine".