2005139497 has 2 divisors, whose sum is σ = 2005139498. Its totient is φ = 2005139496.

The previous prime is 2005139491. The next prime is 2005139501. The reversal of 2005139497 is 7949315002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1135420416 + 869719081 = 33696^2 + 29491^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005139497 - 2¹⁵ = 2005106729 is a prime.

It is not a weakly prime, because it can be changed into another prime (2005139491) 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, 1002569748 + 1002569749.

It is an arithmetic number, because the mean of its divisors is an integer number (1002569749).

Almost surely, 2^2005139497 is an apocalyptic number.

It is an amenable number.

2005139497 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005139497 is an equidigital number, since it uses as much as digits as its factorization.

2005139497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 2005139497 is about 44778.7840053747. The cubic root of 2005139497 is about 1260.9993535080. Note that the first 3 decimals are identical.

The spelling of 2005139497 in words is "two billion, five million, one hundred thirty-nine thousand, four hundred ninety-seven".