64531421 has 8 divisors (see below), whose sum is σ = 65457504. Its totient is φ = 63609040.

The previous prime is 64531361. The next prime is 64531471. The reversal of 64531421 is 12413546.

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 64531421 - 2¹⁰ = 64530397 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 (64531471) 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 7 ways as a sum of consecutive naturals, for example, 67670 + ... + 68616.

It is an arithmetic number, because the mean of its divisors is an integer number (8182188).

Almost surely, 2^64531421 is an apocalyptic number.

It is an amenable number.

64531421 is a deficient number, since it is larger than the sum of its proper divisors (926083).

64531421 is an equidigital number, since it uses as much as digits as its factorization.

64531421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851.

The product of its digits is 2880, while the sum is 26.

The square root of 64531421 is about 8033.1451499397. The cubic root of 64531421 is about 401.1040768154.

Adding to 64531421 its reverse (12413546), we get a palindrome (76944967).

The spelling of 64531421 in words is "sixty-four million, five hundred thirty-one thousand, four hundred twenty-one".