438545661 has 4 divisors (see below), whose sum is σ = 584727552. Its totient is φ = 292363772.

The previous prime is 438545659. The next prime is 438545671. The reversal of 438545661 is 166545834.

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 438545661 - 2¹ = 438545659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438545621) 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, 73090941 + ... + 73090946.

It is an arithmetic number, because the mean of its divisors is an integer number (146181888).

Almost surely, 2^438545661 is an apocalyptic number.

It is an amenable number.

438545661 is a deficient number, since it is larger than the sum of its proper divisors (146181891).

438545661 is a wasteful number, since it uses less digits than its factorization.

438545661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146181890.

The product of its digits is 345600, while the sum is 42.

The square root of 438545661 is about 20941.4818243600. The cubic root of 438545661 is about 759.7515698865.

The spelling of 438545661 in words is "four hundred thirty-eight million, five hundred forty-five thousand, six hundred sixty-one".