1640497283 has 2 divisors, whose sum is σ = 1640497284. Its totient is φ = 1640497282.

The previous prime is 1640497273. The next prime is 1640497303. The reversal of 1640497283 is 3827940461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640497283 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640497213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820248641 + 820248642.

It is an arithmetic number, because the mean of its divisors is an integer number (820248642).

Almost surely, 2^1640497283 is an apocalyptic number.

1640497283 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640497283 is an equidigital number, since it uses as much as digits as its factorization.

1640497283 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1640497283 is about 40503.0527614895. The cubic root of 1640497283 is about 1179.3928896006.

The spelling of 1640497283 in words is "one billion, six hundred forty million, four hundred ninety-seven thousand, two hundred eighty-three".