994139519 has 2 divisors, whose sum is σ = 994139520. Its totient is φ = 994139518.

The previous prime is 994139507. The next prime is 994139521. The reversal of 994139519 is 915931499.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-994139519 is a prime.

It is a super-2 number, since 2×994139519² = 1976626766475102722, which contains 22 as substring.

Together with 994139521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994139539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497069759 + 497069760.

It is an arithmetic number, because the mean of its divisors is an integer number (497069760).

Almost surely, 2^994139519 is an apocalyptic number.

994139519 is a deficient number, since it is larger than the sum of its proper divisors (1).

994139519 is an equidigital number, since it uses as much as digits as its factorization.

994139519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 393660, while the sum is 50.

The square root of 994139519 is about 31529.9781002144. The cubic root of 994139519 is about 998.0426777224.

The spelling of 994139519 in words is "nine hundred ninety-four million, one hundred thirty-nine thousand, five hundred nineteen".