1640311 has 2 divisors, whose sum is σ = 1640312. Its totient is φ = 1640310.

The previous prime is 1640299. The next prime is 1640323. The reversal of 1640311 is 1130461.

It is a balanced prime because it is at equal distance from previous prime (1640299) and next prime (1640323).

It is a cyclic number.

It is not a de Polignac number, because 1640311 - 2⁷ = 1640183 is a prime.

1640311 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820155 + 820156.

It is an arithmetic number, because the mean of its divisors is an integer number (820156).

2^1640311 is an apocalyptic number.

1640311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640311 is an equidigital number, since it uses as much as digits as its factorization.

1640311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1640311 is about 1280.7462668304. The cubic root of 1640311 is about 117.9348246804.

Adding to 1640311 its reverse (1130461), we get a palindrome (2770772).

The spelling of 1640311 in words is "one million, six hundred forty thousand, three hundred eleven".