55121237 has 4 divisors (see below), whose sum is σ = 55190016. Its totient is φ = 55052460.

The previous prime is 55121233. The next prime is 55121239. The reversal of 55121237 is 73212155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55121237 - 2² = 55121233 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121233) 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, 33173 + ... + 34794.

It is an arithmetic number, because the mean of its divisors is an integer number (13797504).

Almost surely, 2^55121237 is an apocalyptic number.

It is an amenable number.

55121237 is a deficient number, since it is larger than the sum of its proper divisors (68779).

55121237 is an equidigital number, since it uses as much as digits as its factorization.

55121237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68778.

The product of its digits is 2100, while the sum is 26.

The square root of 55121237 is about 7424.3677845322. The cubic root of 55121237 is about 380.5744704337.

The spelling of 55121237 in words is "fifty-five million, one hundred twenty-one thousand, two hundred thirty-seven".