55206731 has 4 divisors (see below), whose sum is σ = 55326432. Its totient is φ = 55087032.

The previous prime is 55206721. The next prime is 55206733. The reversal of 55206731 is 13760255.

55206731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13760255 = 5 ⋅2752051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55206731 is a prime.

It is a super-2 number, since 2×55206731² = 6095566295412722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55206694 and 55206703.

It is not an unprimeable number, because it can be changed into a prime (55206733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59156 + ... + 60081.

It is an arithmetic number, because the mean of its divisors is an integer number (13831608).

Almost surely, 2^55206731 is an apocalyptic number.

55206731 is a deficient number, since it is larger than the sum of its proper divisors (119701).

55206731 is a wasteful number, since it uses less digits than its factorization.

55206731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119700.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 55206731 is about 7430.1232156674. The cubic root of 55206731 is about 380.7711280094.

Adding to 55206731 its reverse (13760255), we get a palindrome (68966986).

The spelling of 55206731 in words is "fifty-five million, two hundred six thousand, seven hundred thirty-one".