55810831 has 4 divisors (see below), whose sum is σ = 56166472. Its totient is φ = 55455192.

The previous prime is 55810829. The next prime is 55810841. The reversal of 55810831 is 13801855.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13801855 = 5 ⋅2760371.

It is a cyclic number.

It is not a de Polignac number, because 55810831 - 2¹ = 55810829 is a prime.

It is a super-2 number, since 2×55810831² = 6229697713821122, 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 = 55810793 and 55810802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55810841) 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, 177585 + ... + 177898.

It is an arithmetic number, because the mean of its divisors is an integer number (14041618).

Almost surely, 2^55810831 is an apocalyptic number.

55810831 is a deficient number, since it is larger than the sum of its proper divisors (355641).

55810831 is a wasteful number, since it uses less digits than its factorization.

55810831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355640.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 55810831 is about 7470.6646959959. The cubic root of 55810831 is about 382.1549561854.

The spelling of 55810831 in words is "fifty-five million, eight hundred ten thousand, eight hundred thirty-one".