54021551 has 4 divisors (see below), whose sum is σ = 54051432. Its totient is φ = 53991672.

The previous prime is 54021511. The next prime is 54021553. The reversal of 54021551 is 15512045.

It is a happy number.

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 54021551 - 2¹⁴ = 54005167 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 (54021553) 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, 12041 + ... + 15906.

It is an arithmetic number, because the mean of its divisors is an integer number (13512858).

Almost surely, 2^54021551 is an apocalyptic number.

54021551 is a deficient number, since it is larger than the sum of its proper divisors (29881).

54021551 is a wasteful number, since it uses less digits than its factorization.

54021551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29880.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 54021551 is about 7349.9354418934. The cubic root of 54021551 is about 378.0265907966.

Adding to 54021551 its reverse (15512045), we get a palindrome (69533596).

The spelling of 54021551 in words is "fifty-four million, twenty-one thousand, five hundred fifty-one".