54661687 has 2 divisors, whose sum is σ = 54661688. Its totient is φ = 54661686.

The previous prime is 54661679. The next prime is 54661721. The reversal of 54661687 is 78616645.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 54661687 - 2³ = 54661679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54661667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27330843 + 27330844.

It is an arithmetic number, because the mean of its divisors is an integer number (27330844).

Almost surely, 2^54661687 is an apocalyptic number.

54661687 is a deficient number, since it is larger than the sum of its proper divisors (1).

54661687 is an equidigital number, since it uses as much as digits as its factorization.

54661687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 54661687 is about 7393.3542455370. The cubic root of 54661687 is about 379.5138913458.

The spelling of 54661687 in words is "fifty-four million, six hundred sixty-one thousand, six hundred eighty-seven".