55211971 has 4 divisors (see below), whose sum is σ = 58459752. Its totient is φ = 51964192.

The previous prime is 55211941. The next prime is 55211977. The reversal of 55211971 is 17911255.

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 55211971 - 2⁷ = 55211843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55211977) 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, 1623865 + ... + 1623898.

It is an arithmetic number, because the mean of its divisors is an integer number (14614938).

Almost surely, 2^55211971 is an apocalyptic number.

55211971 is a deficient number, since it is larger than the sum of its proper divisors (3247781).

55211971 is a wasteful number, since it uses less digits than its factorization.

55211971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247780.

The product of its digits is 3150, while the sum is 31.

The square root of 55211971 is about 7430.4758259482. The cubic root of 55211971 is about 380.7831747143.

The spelling of 55211971 in words is "fifty-five million, two hundred eleven thousand, nine hundred seventy-one".