54781553 has 2 divisors, whose sum is σ = 54781554. Its totient is φ = 54781552.

The previous prime is 54781549. The next prime is 54781567. The reversal of 54781553 is 35518745.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41113744 + 13667809 = 6412^2 + 3697^2 .

It is a cyclic number.

It is not a de Polignac number, because 54781553 - 2² = 54781549 is a prime.

It is not a weakly prime, because it can be changed into another prime (54781583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27390776 + 27390777.

It is an arithmetic number, because the mean of its divisors is an integer number (27390777).

Almost surely, 2^54781553 is an apocalyptic number.

It is an amenable number.

54781553 is a deficient number, since it is larger than the sum of its proper divisors (1).

54781553 is an equidigital number, since it uses as much as digits as its factorization.

54781553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84000, while the sum is 38.

The square root of 54781553 is about 7401.4561405172. The cubic root of 54781553 is about 379.7910970892.

The spelling of 54781553 in words is "fifty-four million, seven hundred eighty-one thousand, five hundred fifty-three".