1640534047 has 2 divisors, whose sum is σ = 1640534048. Its totient is φ = 1640534046.

The previous prime is 1640534003. The next prime is 1640534053. The reversal of 1640534047 is 7404350461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640534047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640534447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820267023 + 820267024.

It is an arithmetic number, because the mean of its divisors is an integer number (820267024).

Almost surely, 2^1640534047 is an apocalyptic number.

1640534047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640534047 is an equidigital number, since it uses as much as digits as its factorization.

1640534047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 1640534047 is about 40503.5066012808. The cubic root of 1640534047 is about 1179.4016997090.

It can be divided in two parts, 164053 and 4047, that added together give a square (168100 = 410²).

The spelling of 1640534047 in words is "one billion, six hundred forty million, five hundred thirty-four thousand, forty-seven".