1640931211 has 2 divisors, whose sum is σ = 1640931212. Its totient is φ = 1640931210.

The previous prime is 1640931179. The next prime is 1640931247. The reversal of 1640931211 is 1121390461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1640931211 - 2⁵ = 1640931179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640931211.

It is not a weakly prime, because it can be changed into another prime (1640931311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820465605 + 820465606.

It is an arithmetic number, because the mean of its divisors is an integer number (820465606).

Almost surely, 2^1640931211 is an apocalyptic number.

1640931211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640931211 is an equidigital number, since it uses as much as digits as its factorization.

1640931211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1640931211 is about 40508.4091393380. The cubic root of 1640931211 is about 1179.4968675198.

The spelling of 1640931211 in words is "one billion, six hundred forty million, nine hundred thirty-one thousand, two hundred eleven".