1643272993 has 8 divisors (see below), whose sum is σ = 1682071776. Its totient is φ = 1604500800.

The previous prime is 1643272987. The next prime is 1643273029. The reversal of 1643272993 is 3992723461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1643272993 - 2²¹ = 1641175841 is a prime.

It is a super-2 number, since 2×1643272993² = 5400692259046356098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643272933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177858 + ... + 186868.

It is an arithmetic number, because the mean of its divisors is an integer number (210258972).

Almost surely, 2^1643272993 is an apocalyptic number.

It is an amenable number.

1643272993 is a deficient number, since it is larger than the sum of its proper divisors (38798783).

1643272993 is an equidigital number, since it uses as much as digits as its factorization.

1643272993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13295.

The product of its digits is 489888, while the sum is 46.

The square root of 1643272993 is about 40537.3037213873. The cubic root of 1643272993 is about 1180.0576896530.

The spelling of 1643272993 in words is "one billion, six hundred forty-three million, two hundred seventy-two thousand, nine hundred ninety-three".