1640911403 has 2 divisors, whose sum is σ = 1640911404. Its totient is φ = 1640911402.

The previous prime is 1640911387. The next prime is 1640911457. The reversal of 1640911403 is 3041190461.

It is a weak prime.

It is an emirp because it is prime and its reverse (3041190461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640911403 - 2⁴ = 1640911387 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640911463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820455701 + 820455702.

It is an arithmetic number, because the mean of its divisors is an integer number (820455702).

Almost surely, 2^1640911403 is an apocalyptic number.

1640911403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640911403 is an equidigital number, since it uses as much as digits as its factorization.

1640911403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1640911403 is about 40508.1646461550. The cubic root of 1640911403 is about 1179.4921215219.

The spelling of 1640911403 in words is "one billion, six hundred forty million, nine hundred eleven thousand, four hundred three".