55409911 has 4 divisors (see below), whose sum is σ = 55425112. Its totient is φ = 55394712.

The previous prime is 55409873. The next prime is 55409933. The reversal of 55409911 is 11990455.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55409911 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 (55409941) 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, 1501 + ... + 10633.

It is an arithmetic number, because the mean of its divisors is an integer number (13856278).

Almost surely, 2^55409911 is an apocalyptic number.

55409911 is a deficient number, since it is larger than the sum of its proper divisors (15201).

55409911 is an equidigital number, since it uses as much as digits as its factorization.

55409911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15200.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 55409911 is about 7443.7833794382. The cubic root of 55409911 is about 381.2376795804.

It can be divided in two parts, 5540 and 9911, that added together give a palindrome (15451).

The spelling of 55409911 in words is "fifty-five million, four hundred nine thousand, nine hundred eleven".