55142081 has 2 divisors, whose sum is σ = 55142082. Its totient is φ = 55142080.

The previous prime is 55142053. The next prime is 55142093. The reversal of 55142081 is 18024155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31181056 + 23961025 = 5584^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 55142081 - 2²² = 50947777 is a prime.

It is a super-2 number, since 2×55142081² = 6081298194021122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3290228 and since 55142081 and 3290228 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55142081.

It is not a weakly prime, because it can be changed into another prime (55142051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27571040 + 27571041.

It is an arithmetic number, because the mean of its divisors is an integer number (27571041).

Almost surely, 2^55142081 is an apocalyptic number.

It is an amenable number.

55142081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55142081 is an equidigital number, since it uses as much as digits as its factorization.

55142081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 55142081 is about 7425.7714077394. The cubic root of 55142081 is about 380.6224355798.

The spelling of 55142081 in words is "fifty-five million, one hundred forty-two thousand, eighty-one".