54857639 has 2 divisors, whose sum is σ = 54857640. Its totient is φ = 54857638.

The previous prime is 54857633. The next prime is 54857641. The reversal of 54857639 is 93675845.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 54857639 - 2¹⁶ = 54792103 is a prime.

Together with 54857641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 54857593 and 54857602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54857633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27428819 + 27428820.

It is an arithmetic number, because the mean of its divisors is an integer number (27428820).

Almost surely, 2^54857639 is an apocalyptic number.

54857639 is a deficient number, since it is larger than the sum of its proper divisors (1).

54857639 is an equidigital number, since it uses as much as digits as its factorization.

54857639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The square root of 54857639 is about 7406.5942915756. The cubic root of 54857639 is about 379.9668461380.

The spelling of 54857639 in words is "fifty-four million, eight hundred fifty-seven thousand, six hundred thirty-nine".