55511331 has 12 divisors (see below), whose sum is σ = 78117192. Its totient is φ = 35059104.

The previous prime is 55511329. The next prime is 55511353. The reversal of 55511331 is 13311555.

It is not a de Polignac number, because 55511331 - 2¹ = 55511329 is a prime.

It is a super-2 number, since 2×55511331² = 6163015738783122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55511311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24546 + ... + 26711.

It is an arithmetic number, because the mean of its divisors is an integer number (6509766).

Almost surely, 2^55511331 is an apocalyptic number.

55511331 is a deficient number, since it is larger than the sum of its proper divisors (22605861).

55511331 is a wasteful number, since it uses less digits than its factorization.

55511331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51298 (or 51279 counting only the distinct ones).

The product of its digits is 1125, while the sum is 24.

The square root of 55511331 is about 7450.5926609901. The cubic root of 55511331 is about 381.4701383492.

Adding to 55511331 its reverse (13311555), we get a palindrome (68822886).

The spelling of 55511331 in words is "fifty-five million, five hundred eleven thousand, three hundred thirty-one".