1606139 has 2 divisors, whose sum is σ = 1606140. Its totient is φ = 1606138.

The previous prime is 1606123. The next prime is 1606151. The reversal of 1606139 is 9316061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1606139 - 2⁴ = 1606123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1606439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803069 + 803070.

It is an arithmetic number, because the mean of its divisors is an integer number (803070).

2^1606139 is an apocalyptic number.

1606139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606139 is an equidigital number, since it uses as much as digits as its factorization.

1606139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1606139 is about 1267.3353936508. The cubic root of 1606139 is about 117.1101064928.

The spelling of 1606139 in words is "one million, six hundred six thousand, one hundred thirty-nine".