63554591 has 4 divisors (see below), whose sum is σ = 63616800. Its totient is φ = 63492384.

The previous prime is 63554537. The next prime is 63554593. The reversal of 63554591 is 19545536.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63554591 - 2⁶ = 63554527 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 (63554593) 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, 29546 + ... + 31623.

It is an arithmetic number, because the mean of its divisors is an integer number (15904200).

Almost surely, 2^63554591 is an apocalyptic number.

63554591 is a deficient number, since it is larger than the sum of its proper divisors (62209).

63554591 is a wasteful number, since it uses less digits than its factorization.

63554591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62208.

The product of its digits is 81000, while the sum is 38.

The square root of 63554591 is about 7972.1133333640. The cubic root of 63554591 is about 399.0699035611.

The spelling of 63554591 in words is "sixty-three million, five hundred fifty-four thousand, five hundred ninety-one".