1640254139 has 2 divisors, whose sum is σ = 1640254140. Its totient is φ = 1640254138.

The previous prime is 1640254093. The next prime is 1640254153. The reversal of 1640254139 is 9314520461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640254139 - 2⁸ = 1640253883 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640254099 and 1640254108.

It is not a weakly prime, because it can be changed into another prime (1640259139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820127069 + 820127070.

It is an arithmetic number, because the mean of its divisors is an integer number (820127070).

Almost surely, 2^1640254139 is an apocalyptic number.

1640254139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640254139 is an equidigital number, since it uses as much as digits as its factorization.

1640254139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1640254139 is about 40500.0510987332. The cubic root of 1640254139 is about 1179.3346193684.

The spelling of 1640254139 in words is "one billion, six hundred forty million, two hundred fifty-four thousand, one hundred thirty-nine".