1641633897 has 4 divisors (see below), whose sum is σ = 2188845200. Its totient is φ = 1094422596.

The previous prime is 1641633893. The next prime is 1641633941. The reversal of 1641633897 is 7983361461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1641633897 - 2² = 1641633893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641633893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273605647 + ... + 273605652.

It is an arithmetic number, because the mean of its divisors is an integer number (547211300).

Almost surely, 2^1641633897 is an apocalyptic number.

It is an amenable number.

1641633897 is a deficient number, since it is larger than the sum of its proper divisors (547211303).

1641633897 is an equidigital number, since it uses as much as digits as its factorization.

1641633897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547211302.

The product of its digits is 653184, while the sum is 48.

The square root of 1641633897 is about 40517.0815459357. The cubic root of 1641633897 is about 1179.6652064183.

The spelling of 1641633897 in words is "one billion, six hundred forty-one million, six hundred thirty-three thousand, eight hundred ninety-seven".