1640817049 has 3 divisors (see below), whose sum is σ = 1640857557. Its totient is φ = 1640776542.

The previous prime is 1640817041. The next prime is 1640817053. The reversal of 1640817049 is 9407180461.

The square root of 1640817049 is 40507.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1640817049 - 2³ = 1640817041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640817041) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20254 + ... + 60760.

It is an arithmetic number, because the mean of its divisors is an integer number (546952519).

Almost surely, 2^1640817049 is an apocalyptic number.

1640817049 is the 40507-th square number.

1640817049 is the 20254-th centered octagonal number.

It is an amenable number.

1640817049 is a deficient number, since it is larger than the sum of its proper divisors (40508).

1640817049 is an frugal number, since it uses more digits than its factorization.

1640817049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81014 (or 40507 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The cubic root of 1640817049 is about 1179.4695137743.

The spelling of 1640817049 in words is "one billion, six hundred forty million, eight hundred seventeen thousand, forty-nine".