55015181 has 8 divisors (see below), whose sum is σ = 59341464. Its totient is φ = 50702400.

The previous prime is 55015159. The next prime is 55015187. The reversal of 55015181 is 18151055.

It can be written as a sum of positive squares in 4 ways, for example, as 3031081 + 51984100 = 1741^2 + 7210^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55015181 is a prime.

It is a super-2 number, since 2×55015181² = 6053340280925522, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55015181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55015187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6095 + ... + 12131.

It is an arithmetic number, because the mean of its divisors is an integer number (7417683).

Almost surely, 2^55015181 is an apocalyptic number.

It is an amenable number.

55015181 is a deficient number, since it is larger than the sum of its proper divisors (4326283).

55015181 is a wasteful number, since it uses less digits than its factorization.

55015181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6751.

The product of its (nonzero) digits is 1000, while the sum is 26.

The square root of 55015181 is about 7417.2219192903. The cubic root of 55015181 is about 380.3302323248.

The spelling of 55015181 in words is "fifty-five million, fifteen thousand, one hundred eighty-one".