2158139 has 2 divisors, whose sum is σ = 2158140. Its totient is φ = 2158138.

The previous prime is 2158129. The next prime is 2158147. The reversal of 2158139 is 9318512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2158139 - 2¹² = 2154043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2158129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079069 + 1079070.

It is an arithmetic number, because the mean of its divisors is an integer number (1079070).

2^2158139 is an apocalyptic number.

2158139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158139 is an equidigital number, since it uses as much as digits as its factorization.

2158139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The square root of 2158139 is about 1469.0605841830. The cubic root of 2158139 is about 129.2289466336.

The spelling of 2158139 in words is "two million, one hundred fifty-eight thousand, one hundred thirty-nine".