999961139 has 2 divisors, whose sum is σ = 999961140. Its totient is φ = 999961138.

The previous prime is 999961129. The next prime is 999961147. The reversal of 999961139 is 931169999.

It is a strong prime.

It is an emirp because it is prime and its reverse (931169999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999961139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999961129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499980569 + 499980570.

It is an arithmetic number, because the mean of its divisors is an integer number (499980570).

Almost surely, 2^999961139 is an apocalyptic number.

999961139 is a deficient number, since it is larger than the sum of its proper divisors (1).

999961139 is an equidigital number, since it uses as much as digits as its factorization.

999961139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1062882, while the sum is 56.

The square root of 999961139 is about 31622.1621493534. The cubic root of 999961139 is about 999.9870461655.

The spelling of 999961139 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, one hundred thirty-nine".