847539139 has 2 divisors, whose sum is σ = 847539140. Its totient is φ = 847539138.

The previous prime is 847539089. The next prime is 847539151. The reversal of 847539139 is 931935748.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-847539139 is a prime.

It is a super-2 number, since 2×847539139² = 1436645184273722642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 847539092 and 847539101.

It is not a weakly prime, because it can be changed into another prime (847539439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423769569 + 423769570.

It is an arithmetic number, because the mean of its divisors is an integer number (423769570).

Almost surely, 2^847539139 is an apocalyptic number.

847539139 is a deficient number, since it is larger than the sum of its proper divisors (1).

847539139 is an equidigital number, since it uses as much as digits as its factorization.

847539139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 847539139 is about 29112.5254658540. The cubic root of 847539139 is about 946.3531984819.

The spelling of 847539139 in words is "eight hundred forty-seven million, five hundred thirty-nine thousand, one hundred thirty-nine".