55639131 has 4 divisors (see below), whose sum is σ = 74185512. Its totient is φ = 37092752.

The previous prime is 55639127. The next prime is 55639217. The reversal of 55639131 is 13193655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55639131 - 2² = 55639127 is a prime.

It is a super-2 number, since 2×55639131² = 6191425796870322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55639092 and 55639101.

It is not an unprimeable number, because it can be changed into a prime (55639531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9273186 + ... + 9273191.

It is an arithmetic number, because the mean of its divisors is an integer number (18546378).

Almost surely, 2^55639131 is an apocalyptic number.

55639131 is a deficient number, since it is larger than the sum of its proper divisors (18546381).

55639131 is a wasteful number, since it uses less digits than its factorization.

55639131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18546380.

The product of its digits is 12150, while the sum is 33.

The square root of 55639131 is about 7459.1642293222. The cubic root of 55639131 is about 381.7626583198.

The spelling of 55639131 in words is "fifty-five million, six hundred thirty-nine thousand, one hundred thirty-one".