64431143 has 4 divisors (see below), whose sum is σ = 73635600. Its totient is φ = 55226688.

The previous prime is 64431121. The next prime is 64431161. The reversal of 64431143 is 34113446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64431143 - 2⁶ = 64431079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64431163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4602218 + ... + 4602231.

It is an arithmetic number, because the mean of its divisors is an integer number (18408900).

Almost surely, 2^64431143 is an apocalyptic number.

64431143 is a deficient number, since it is larger than the sum of its proper divisors (9204457).

64431143 is an equidigital number, since it uses as much as digits as its factorization.

64431143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9204456.

The product of its digits is 3456, while the sum is 26.

The square root of 64431143 is about 8026.9012078136. The cubic root of 64431143 is about 400.8962051247.

Adding to 64431143 its reverse (34113446), we get a palindrome (98544589).

The spelling of 64431143 in words is "sixty-four million, four hundred thirty-one thousand, one hundred forty-three".