55139465 has 8 divisors (see below), whose sum is σ = 67781448. Its totient is φ = 43035520.

The previous prime is 55139443. The next prime is 55139467. The reversal of 55139465 is 56493155.

It can be written as a sum of positive squares in 4 ways, for example, as 2199289 + 52940176 = 1483^2 + 7276^2 .

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

It is not a de Polignac number, because 55139465 - 2⁶ = 55139401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55139467) 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, 134282 + ... + 134691.

It is an arithmetic number, because the mean of its divisors is an integer number (8472681).

Almost surely, 2^55139465 is an apocalyptic number.

It is an amenable number.

55139465 is a deficient number, since it is larger than the sum of its proper divisors (12641983).

55139465 is a wasteful number, since it uses less digits than its factorization.

55139465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269019.

The product of its digits is 81000, while the sum is 38.

The square root of 55139465 is about 7425.5952623342. The cubic root of 55139465 is about 380.6164164378.

The spelling of 55139465 in words is "fifty-five million, one hundred thirty-nine thousand, four hundred sixty-five".