54139782691 has 2 divisors, whose sum is σ = 54139782692. Its totient is φ = 54139782690.

The previous prime is 54139782689. The next prime is 54139782713. The reversal of 54139782691 is 19628793145.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 54139782691 - 2¹ = 54139782689 is a prime.

It is a super-2 number, since 2×54139782691² (a number of 22 digits) contains 22 as substring.

Together with 54139782689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (54139782661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27069891345 + 27069891346.

It is an arithmetic number, because the mean of its divisors is an integer number (27069891346).

Almost surely, 2^54139782691 is an apocalyptic number.

54139782691 is a deficient number, since it is larger than the sum of its proper divisors (1).

54139782691 is an equidigital number, since it uses as much as digits as its factorization.

54139782691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 55.

The spelling of 54139782691 in words is "fifty-four billion, one hundred thirty-nine million, seven hundred eighty-two thousand, six hundred ninety-one".