643652141 has 8 divisors (see below), whose sum is σ = 702353568. Its totient is φ = 584982000.

The previous prime is 643652123. The next prime is 643652143. The reversal of 643652141 is 141256346.

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 643652141 - 2⁶ = 643652077 is a prime.

It is a super-2 number, since 2×643652141² = 828576157227767762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643652098 and 643652107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643652143) 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, 63611 + ... + 73031.

It is an arithmetic number, because the mean of its divisors is an integer number (87794196).

Almost surely, 2^643652141 is an apocalyptic number.

It is an amenable number.

643652141 is a deficient number, since it is larger than the sum of its proper divisors (58701427).

643652141 is a wasteful number, since it uses less digits than its factorization.

643652141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15643.

The product of its digits is 17280, while the sum is 32.

The square root of 643652141 is about 25370.3003726799. The cubic root of 643652141 is about 863.4099968030.

The spelling of 643652141 in words is "six hundred forty-three million, six hundred fifty-two thousand, one hundred forty-one".