461643641 has 4 divisors (see below), whose sum is σ = 472903284. Its totient is φ = 450384000.

The previous prime is 461643587. The next prime is 461643643. The reversal of 461643641 is 146346164.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20475625 + 441168016 = 4525^2 + 21004^2 .

It is a cyclic number.

It is not a de Polignac number, because 461643641 - 2¹⁰ = 461642617 is a prime.

It is a super-2 number, since 2×461643641² = 426229702551473762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (461643643) 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, 5629760 + ... + 5629841.

It is an arithmetic number, because the mean of its divisors is an integer number (118225821).

Almost surely, 2^461643641 is an apocalyptic number.

461643641 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

461643641 is a deficient number, since it is larger than the sum of its proper divisors (11259643).

461643641 is a wasteful number, since it uses less digits than its factorization.

461643641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11259642.

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

The square root of 461643641 is about 21485.8940004832. The cubic root of 461643641 is about 772.8625897746.

The spelling of 461643641 in words is "four hundred sixty-one million, six hundred forty-three thousand, six hundred forty-one".