55031121 has 12 divisors (see below), whose sum is σ = 79868880. Its totient is φ = 36512280.

The previous prime is 55031101. The next prime is 55031147. The reversal of 55031121 is 12113055.

55031121 is a `hidden beast` number, since 550 + 3 + 112 + 1 = 666.

It is not a de Polignac number, because 55031121 - 2¹⁷ = 54900049 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55031094 and 55031103.

It is not an unprimeable number, because it can be changed into a prime (55031101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12591 + ... + 16388.

It is an arithmetic number, because the mean of its divisors is an integer number (6655740).

Almost surely, 2^55031121 is an apocalyptic number.

It is an amenable number.

55031121 is a deficient number, since it is larger than the sum of its proper divisors (24837759).

55031121 is a wasteful number, since it uses less digits than its factorization.

55031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29196 (or 29193 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 55031121 is about 7418.2963677653. The cubic root of 55031121 is about 380.3669608446.

Adding to 55031121 its reverse (12113055), we get a palindrome (67144176).

The spelling of 55031121 in words is "fifty-five million, thirty-one thousand, one hundred twenty-one".