1640259139 has 2 divisors, whose sum is σ = 1640259140. Its totient is φ = 1640259138.

The previous prime is 1640259121. The next prime is 1640259149. The reversal of 1640259139 is 9319520461.

It is a strong prime.

It is an emirp because it is prime and its reverse (9319520461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640259139 - 2⁵ = 1640259107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640259149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820129569 + 820129570.

It is an arithmetic number, because the mean of its divisors is an integer number (820129570).

Almost surely, 2^1640259139 is an apocalyptic number.

1640259139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640259139 is an equidigital number, since it uses as much as digits as its factorization.

1640259139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 1640259139 is about 40500.1128270033. The cubic root of 1640259139 is about 1179.3358176922.

The spelling of 1640259139 in words is "one billion, six hundred forty million, two hundred fifty-nine thousand, one hundred thirty-nine".