64121573 has 4 divisors (see below), whose sum is σ = 65331468. Its totient is φ = 62911680.

The previous prime is 64121537. The next prime is 64121621. The reversal of 64121573 is 37512146.

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 55606849 + 8514724 = 7457^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 64121573 - 2⁶ = 64121509 is a prime.

It is a super-2 number, since 2×64121573² = 8223152247988658, 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 (64121513) 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, 604868 + ... + 604973.

It is an arithmetic number, because the mean of its divisors is an integer number (16332867).

Almost surely, 2^64121573 is an apocalyptic number.

It is an amenable number.

64121573 is a deficient number, since it is larger than the sum of its proper divisors (1209895).

64121573 is a wasteful number, since it uses less digits than its factorization.

64121573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209894.

The product of its digits is 5040, while the sum is 29.

The square root of 64121573 is about 8007.5947075261. The cubic root of 64121573 is about 400.2531168792.

The spelling of 64121573 in words is "sixty-four million, one hundred twenty-one thousand, five hundred seventy-three".