63745921 has 4 divisors (see below), whose sum is σ = 63767344. Its totient is φ = 63724500.

The previous prime is 63745907. The next prime is 63745933. The reversal of 63745921 is 12954736.

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 3-Lehmer number, since φ(63745921) divides (63745921-1)³.

It is a cyclic number.

It is not a de Polignac number, because 63745921 - 2¹¹ = 63743873 is a prime.

It is a deceptive number, since it divides R_63745920.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63745961) 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, 5355 + ... + 12496.

It is an arithmetic number, because the mean of its divisors is an integer number (15941836).

Almost surely, 2^63745921 is an apocalyptic number.

It is an amenable number.

63745921 is a deficient number, since it is larger than the sum of its proper divisors (21423).

63745921 is a wasteful number, since it uses less digits than its factorization.

63745921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21422.

The product of its digits is 45360, while the sum is 37.

The square root of 63745921 is about 7984.1042703612. The cubic root of 63745921 is about 399.4699667220.

The spelling of 63745921 in words is "sixty-three million, seven hundred forty-five thousand, nine hundred twenty-one".