994139539 has 2 divisors, whose sum is σ = 994139540. Its totient is φ = 994139538.

The previous prime is 994139521. The next prime is 994139561. The reversal of 994139539 is 935931499.

It is a weak prime.

It is an emirp because it is prime and its reverse (935931499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 994139539 - 2⁵ = 994139507 is a prime.

It is not a weakly prime, because it can be changed into another prime (994139519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497069769 + 497069770.

It is an arithmetic number, because the mean of its divisors is an integer number (497069770).

Almost surely, 2^994139539 is an apocalyptic number.

994139539 is a deficient number, since it is larger than the sum of its proper divisors (1).

994139539 is an equidigital number, since it uses as much as digits as its factorization.

994139539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1180980, while the sum is 52.

The square root of 994139539 is about 31529.9784173729. The cubic root of 994139539 is about 998.0426844152.

The spelling of 994139539 in words is "nine hundred ninety-four million, one hundred thirty-nine thousand, five hundred thirty-nine".