86578139 has 2 divisors, whose sum is σ = 86578140. Its totient is φ = 86578138.

The previous prime is 86578111. The next prime is 86578147. The reversal of 86578139 is 93187568.

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-86578139 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 86578093 and 86578102.

It is not a weakly prime, because it can be changed into another prime (86578159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43289069 + 43289070.

It is an arithmetic number, because the mean of its divisors is an integer number (43289070).

Almost surely, 2^86578139 is an apocalyptic number.

86578139 is a deficient number, since it is larger than the sum of its proper divisors (1).

86578139 is an equidigital number, since it uses as much as digits as its factorization.

86578139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 86578139 is about 9304.7374492782. The cubic root of 86578139 is about 442.3873998239.

The spelling of 86578139 in words is "eighty-six million, five hundred seventy-eight thousand, one hundred thirty-nine".