1643508534 has 32 divisors (see below), whose sum is σ = 3369794400. Its totient is φ = 534060800.

The previous prime is 1643508521. The next prime is 1643508553. The reversal of 1643508534 is 4358053461.

It is a super-2 number, since 2×1643508534² = 5402240602661658312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1643508492 and 1643508501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 625744 + ... + 628364.

It is an arithmetic number, because the mean of its divisors is an integer number (105306075).

Almost surely, 2^1643508534 is an apocalyptic number.

1643508534 is an abundant number, since it is smaller than the sum of its proper divisors (1726285866).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1643508534 is a wasteful number, since it uses less digits than its factorization.

1643508534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216.

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 1643508534 is about 40540.2088549134. The cubic root of 1643508534 is about 1180.1140687392.

The spelling of 1643508534 in words is "one billion, six hundred forty-three million, five hundred eight thousand, five hundred thirty-four".