1640254093 has 2 divisors, whose sum is σ = 1640254094. Its totient is φ = 1640254092.

The previous prime is 1640253997. The next prime is 1640254139. The reversal of 1640254093 is 3904520461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1587066244 + 53187849 = 39838^2 + 7293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640254093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640254793) 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, 820127046 + 820127047.

It is an arithmetic number, because the mean of its divisors is an integer number (820127047).

Almost surely, 2^1640254093 is an apocalyptic number.

It is an amenable number.

1640254093 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640254093 is an equidigital number, since it uses as much as digits as its factorization.

1640254093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1640254093 is about 40500.0505308327. The cubic root of 1640254093 is about 1179.3346083438.

The spelling of 1640254093 in words is "one billion, six hundred forty million, two hundred fifty-four thousand, ninety-three".