54721551 has 4 divisors (see below), whose sum is σ = 72962072. Its totient is φ = 36481032.

The previous prime is 54721547. The next prime is 54721571. The reversal of 54721551 is 15512745.

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

It is not a de Polignac number, because 54721551 - 2² = 54721547 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 (54721571) 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, 9120256 + ... + 9120261.

It is an arithmetic number, because the mean of its divisors is an integer number (18240518).

Almost surely, 2^54721551 is an apocalyptic number.

54721551 is a deficient number, since it is larger than the sum of its proper divisors (18240521).

54721551 is a wasteful number, since it uses less digits than its factorization.

54721551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18240520.

The product of its digits is 7000, while the sum is 30.

The square root of 54721551 is about 7397.4016384133. The cubic root of 54721551 is about 379.6523852469.

The spelling of 54721551 in words is "fifty-four million, seven hundred twenty-one thousand, five hundred fifty-one".