55051311 has 16 divisors (see below), whose sum is σ = 84022784. Its totient is φ = 31407264.

The previous prime is 55051291. The next prime is 55051313. The reversal of 55051311 is 11315055.

It is not a de Polignac number, because 55051311 - 2¹⁰ = 55050287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55051313) 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, 14166 + ... + 17628.

It is an arithmetic number, because the mean of its divisors is an integer number (5251424).

Almost surely, 2^55051311 is an apocalyptic number.

55051311 is a deficient number, since it is larger than the sum of its proper divisors (28971473).

55051311 is a wasteful number, since it uses less digits than its factorization.

55051311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4230.

The product of its (nonzero) digits is 375, while the sum is 21.

The square root of 55051311 is about 7419.6570675470. The cubic root of 55051311 is about 380.4134719206.

Adding to 55051311 its reverse (11315055), we get a palindrome (66366366).

The spelling of 55051311 in words is "fifty-five million, fifty-one thousand, three hundred eleven".