54781439 has 2 divisors, whose sum is σ = 54781440. Its totient is φ = 54781438.

The previous prime is 54781421. The next prime is 54781451. The reversal of 54781439 is 93418745.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 54781439 - 2¹² = 54777343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 54781396 and 54781405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54781409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27390719 + 27390720.

It is an arithmetic number, because the mean of its divisors is an integer number (27390720).

Almost surely, 2^54781439 is an apocalyptic number.

54781439 is a deficient number, since it is larger than the sum of its proper divisors (1).

54781439 is an equidigital number, since it uses as much as digits as its factorization.

54781439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 54781439 is about 7401.4484393259. The cubic root of 54781439 is about 379.7908336415.

The spelling of 54781439 in words is "fifty-four million, seven hundred eighty-one thousand, four hundred thirty-nine".