54640891 has 2 divisors, whose sum is σ = 54640892. Its totient is φ = 54640890.

The previous prime is 54640889. The next prime is 54640909. The reversal of 54640891 is 19804645.

54640891 = T₆₀₃₄ + T₆₀₃₅ + T₆₀₃₆.

It is a happy number.

54640891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 54640891 - 2¹ = 54640889 is a prime.

Together with 54640889, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 54640891.

It is not a weakly prime, because it can be changed into another prime (54640841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27320445 + 27320446.

It is an arithmetic number, because the mean of its divisors is an integer number (27320446).

Almost surely, 2^54640891 is an apocalyptic number.

54640891 is the 6036-th centered triangular number.

54640891 is a deficient number, since it is larger than the sum of its proper divisors (1).

54640891 is an equidigital number, since it uses as much as digits as its factorization.

54640891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 54640891 is about 7391.9477135597. The cubic root of 54640891 is about 379.4657566442.

The spelling of 54640891 in words is "fifty-four million, six hundred forty thousand, eight hundred ninety-one".