641385461 has 4 divisors (see below), whose sum is σ = 644968800. Its totient is φ = 637802124.

The previous prime is 641385403. The next prime is 641385487. The reversal of 641385461 is 164583146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641385461 - 2¹⁴ = 641369077 is a prime.

It is a super-2 number, since 2×641385461² = 822750619164365042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641385361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1791401 + ... + 1791758.

It is an arithmetic number, because the mean of its divisors is an integer number (161242200).

Almost surely, 2^641385461 is an apocalyptic number.

It is an amenable number.

641385461 is a deficient number, since it is larger than the sum of its proper divisors (3583339).

641385461 is a wasteful number, since it uses less digits than its factorization.

641385461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583338.

The product of its digits is 69120, while the sum is 38.

The square root of 641385461 is about 25325.5890553408. The cubic root of 641385461 is about 862.3952789191.

The spelling of 641385461 in words is "six hundred forty-one million, three hundred eighty-five thousand, four hundred sixty-one".