646143461 has 8 divisors (see below), whose sum is σ = 668763000. Its totient is φ = 623546560.

The previous prime is 646143457. The next prime is 646143473. The reversal of 646143461 is 164341646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 141467236 + 504676225 = 11894^2 + 22465^2 .

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 646143461 - 2² = 646143457 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 (646193461) 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, 69551 + ... + 78291.

It is an arithmetic number, because the mean of its divisors is an integer number (83595375).

Almost surely, 2^646143461 is an apocalyptic number.

It is an amenable number.

646143461 is a deficient number, since it is larger than the sum of its proper divisors (22619539).

646143461 is a wasteful number, since it uses less digits than its factorization.

646143461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11319.

The product of its digits is 41472, while the sum is 35.

The square root of 646143461 is about 25419.3520963851. The cubic root of 646143461 is about 864.5225342277.

The spelling of 646143461 in words is "six hundred forty-six million, one hundred forty-three thousand, four hundred sixty-one".