55511142 has 32 divisors (see below), whose sum is σ = 115430400. Its totient is φ = 17777760.

The previous prime is 55511123. The next prime is 55511143. The reversal of 55511142 is 24111555.

It is a super-2 number, since 2×55511142² = 6162973772288328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55511143) 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, 26713 + ... + 28715.

It is an arithmetic number, because the mean of its divisors is an integer number (3607200).

Almost surely, 2^55511142 is an apocalyptic number.

55511142 is an abundant number, since it is smaller than the sum of its proper divisors (59919258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55511142 is a wasteful number, since it uses less digits than its factorization.

55511142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188.

The product of its digits is 1000, while the sum is 24.

The square root of 55511142 is about 7450.5799774246. The cubic root of 55511142 is about 381.4697054169.

Adding to 55511142 its reverse (24111555), we get a palindrome (79622697).

The spelling of 55511142 in words is "fifty-five million, five hundred eleven thousand, one hundred forty-two".