1640583479 has 2 divisors, whose sum is σ = 1640583480. Its totient is φ = 1640583478.

The previous prime is 1640583437. The next prime is 1640583493. The reversal of 1640583479 is 9743850461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640583479 - 2¹⁶ = 1640517943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640583409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820291739 + 820291740.

It is an arithmetic number, because the mean of its divisors is an integer number (820291740).

Almost surely, 2^1640583479 is an apocalyptic number.

1640583479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640583479 is an equidigital number, since it uses as much as digits as its factorization.

1640583479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 1640583479 is about 40504.1168154547. The cubic root of 1640583479 is about 1179.4135453636.

The spelling of 1640583479 in words is "one billion, six hundred forty million, five hundred eighty-three thousand, four hundred seventy-nine".