55551031 has 4 divisors (see below), whose sum is σ = 55644064. Its totient is φ = 55458000.

The previous prime is 55551017. The next prime is 55551043. The reversal of 55551031 is 13015555.

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 55551031 - 2⁷ = 55550903 is a prime.

It is a super-2 number, since 2×55551031² = 6171834090325922, 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 = 55550987 and 55551005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551011) 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, 45615 + ... + 46816.

It is an arithmetic number, because the mean of its divisors is an integer number (13911016).

Almost surely, 2^55551031 is an apocalyptic number.

55551031 is a deficient number, since it is larger than the sum of its proper divisors (93033).

55551031 is an equidigital number, since it uses as much as digits as its factorization.

55551031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93032.

The product of its (nonzero) digits is 1875, while the sum is 25.

The square root of 55551031 is about 7453.2564024056. The cubic root of 55551031 is about 381.5610552569.

Adding to 55551031 its reverse (13015555), we get a palindrome (68566586).

The spelling of 55551031 in words is "fifty-five million, five hundred fifty-one thousand, thirty-one".