55139287 has 16 divisors (see below), whose sum is σ = 66237952. Its totient is φ = 44906400.

The previous prime is 55139263. The next prime is 55139291. The reversal of 55139287 is 78293155.

It is not a de Polignac number, because 55139287 - 2²³ = 46750679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55139087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8662 + ... + 13612.

It is an arithmetic number, because the mean of its divisors is an integer number (4139872).

Almost surely, 2^55139287 is an apocalyptic number.

55139287 is a deficient number, since it is larger than the sum of its proper divisors (11098665).

55139287 is a wasteful number, since it uses less digits than its factorization.

55139287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5038.

The product of its digits is 75600, while the sum is 40.

The square root of 55139287 is about 7425.5832767534. The cubic root of 55139287 is about 380.6160068716.

The spelling of 55139287 in words is "fifty-five million, one hundred thirty-nine thousand, two hundred eighty-seven".