643453131 has 16 divisors (see below), whose sum is σ = 891424800. Its totient is φ = 412355328.

The previous prime is 643453127. The next prime is 643453147. The reversal of 643453131 is 131354346.

It is not a de Polignac number, because 643453131 - 2² = 643453127 is a prime.

It is a super-2 number, since 2×643453131² = 828063863587406322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643453331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3775 + ... + 36071.

It is an arithmetic number, because the mean of its divisors is an integer number (55714050).

Almost surely, 2^643453131 is an apocalyptic number.

643453131 is a deficient number, since it is larger than the sum of its proper divisors (247971669).

643453131 is a wasteful number, since it uses less digits than its factorization.

643453131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32558.

The product of its digits is 12960, while the sum is 30.

The square root of 643453131 is about 25366.3779637535. The cubic root of 643453131 is about 863.3210020782.

It can be divided in two parts, 64345 and 3131, that added together give a palindrome (67476).

The spelling of 643453131 in words is "six hundred forty-three million, four hundred fifty-three thousand, one hundred thirty-one".