55911311 has 4 divisors (see below), whose sum is σ = 56267592. Its totient is φ = 55555032.

The previous prime is 55911307. The next prime is 55911337. The reversal of 55911311 is 11311955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11311955 = 5 ⋅2262391.

It is a cyclic number.

It is not a de Polignac number, because 55911311 - 2² = 55911307 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 (55911301) 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, 177905 + ... + 178218.

It is an arithmetic number, because the mean of its divisors is an integer number (14066898).

Almost surely, 2^55911311 is an apocalyptic number.

55911311 is a deficient number, since it is larger than the sum of its proper divisors (356281).

55911311 is a wasteful number, since it uses less digits than its factorization.

55911311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356280.

The product of its digits is 675, while the sum is 26.

The square root of 55911311 is about 7477.3866424039. The cubic root of 55911311 is about 382.3841584643.

It can be divided in two parts, 55 and 911311, that multiplied together give a palindrome (50122105).

The spelling of 55911311 in words is "fifty-five million, nine hundred eleven thousand, three hundred eleven".