55139271 has 8 divisors (see below), whose sum is σ = 80202624. Its totient is φ = 33417720.

The previous prime is 55139263. The next prime is 55139291. The reversal of 55139271 is 17293155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55139271 - 2³ = 55139263 is a prime.

It is a super-2 number, since 2×55139271² = 6080678412822882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1670887 = 55139271 / (5 + 5 + 1 + 3 + 9 + 2 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55139221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835411 + ... + 835476.

It is an arithmetic number, because the mean of its divisors is an integer number (10025328).

Almost surely, 2^55139271 is an apocalyptic number.

55139271 is a deficient number, since it is larger than the sum of its proper divisors (25063353).

55139271 is a wasteful number, since it uses less digits than its factorization.

55139271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670901.

The product of its digits is 9450, while the sum is 33.

The square root of 55139271 is about 7425.5821993969. The cubic root of 55139271 is about 380.6159700566.

The spelling of 55139271 in words is "fifty-five million, one hundred thirty-nine thousand, two hundred seventy-one".