54405551 has 2 divisors, whose sum is σ = 54405552. Its totient is φ = 54405550.

The previous prime is 54405539. The next prime is 54405553. The reversal of 54405551 is 15550445.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 54405551 - 2¹⁰ = 54404527 is a prime.

It is a super-2 number, since 2×54405551² = 5919927959227202, which contains 22 as substring.

Together with 54405553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54405553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27202775 + 27202776.

It is an arithmetic number, because the mean of its divisors is an integer number (27202776).

Almost surely, 2^54405551 is an apocalyptic number.

54405551 is a deficient number, since it is larger than the sum of its proper divisors (1).

54405551 is an equidigital number, since it uses as much as digits as its factorization.

54405551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 54405551 is about 7376.0118627887. The cubic root of 54405551 is about 378.9201823919.

Adding to 54405551 its reverse (15550445), we get a palindrome (69955996).

The spelling of 54405551 in words is "fifty-four million, four hundred five thousand, five hundred fifty-one".