1643130511 has 24 divisors (see below), whose sum is σ = 1899418752. Its totient is φ = 1417587600.

The previous prime is 1643130487. The next prime is 1643130551. The reversal of 1643130511 is 1150313461.

It is a de Polignac number, because none of the positive numbers 2^k-1643130511 is a prime.

It is a super-2 number, since 2×1643130511² = 5399755752358242242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643130551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 362320 + ... + 366826.

It is an arithmetic number, because the mean of its divisors is an integer number (79142448).

Almost surely, 2^1643130511 is an apocalyptic number.

1643130511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1643130511 is a deficient number, since it is larger than the sum of its proper divisors (256288241).

1643130511 is a wasteful number, since it uses less digits than its factorization.

1643130511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4683 (or 4672 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1643130511 is about 40535.5462649759. The cubic root of 1643130511 is about 1180.0235825508.

Adding to 1643130511 its reverse (1150313461), we get a palindrome (2793443972).

The spelling of 1643130511 in words is "one billion, six hundred forty-three million, one hundred thirty thousand, five hundred eleven".