55211009 has 16 divisors (see below), whose sum is σ = 64146432. Its totient is φ = 46545408.

The previous prime is 55211003. The next prime is 55211027. The reversal of 55211009 is 90011255.

It is not a de Polignac number, because 55211009 - 2¹⁶ = 55145473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55211003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176237 + ... + 176549.

It is an arithmetic number, because the mean of its divisors is an integer number (4009152).

Almost surely, 2^55211009 is an apocalyptic number.

It is an amenable number.

55211009 is a deficient number, since it is larger than the sum of its proper divisors (8935423).

55211009 is a wasteful number, since it uses less digits than its factorization.

55211009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 55211009 is about 7430.4110922613. The cubic root of 55211009 is about 380.7809631435.

The spelling of 55211009 in words is "fifty-five million, two hundred eleven thousand, nine".