1640596549 has 2 divisors, whose sum is σ = 1640596550. Its totient is φ = 1640596548.

The previous prime is 1640596537. The next prime is 1640596561. The reversal of 1640596549 is 9456950461.

It is a balanced prime because it is at equal distance from previous prime (1640596537) and next prime (1640596561).

It can be written as a sum of positive squares in only one way, i.e., 1249269025 + 391327524 = 35345^2 + 19782^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640596549 - 2¹⁵ = 1640563781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640596589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820298274 + 820298275.

It is an arithmetic number, because the mean of its divisors is an integer number (820298275).

Almost surely, 2^1640596549 is an apocalyptic number.

It is an amenable number.

1640596549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640596549 is an equidigital number, since it uses as much as digits as its factorization.

1640596549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 1640596549 is about 40504.2781567577. The cubic root of 1640596549 is about 1179.4166773579.

The spelling of 1640596549 in words is "one billion, six hundred forty million, five hundred ninety-six thousand, five hundred forty-nine".