55103121 has 6 divisors (see below), whose sum is σ = 79593410. Its totient is φ = 36735408.

The previous prime is 55103117. The next prime is 55103131. The reversal of 55103121 is 12130155.

It can be written as a sum of positive squares in only one way, i.e., 29550096 + 25553025 = 5436^2 + 5055^2 .

It is not a de Polignac number, because 55103121 - 2² = 55103117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55103094 and 55103103.

It is not an unprimeable number, because it can be changed into a prime (55103131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3061276 + ... + 3061293.

Almost surely, 2^55103121 is an apocalyptic number.

It is an amenable number.

55103121 is a deficient number, since it is larger than the sum of its proper divisors (24490289).

55103121 is a wasteful number, since it uses less digits than its factorization.

55103121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6122575 (or 6122572 counting only the distinct ones).

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

The square root of 55103121 is about 7423.1476477300. The cubic root of 55103121 is about 380.5327729989.

Adding to 55103121 its reverse (12130155), we get a palindrome (67233276).

The spelling of 55103121 in words is "fifty-five million, one hundred three thousand, one hundred twenty-one".