55278001 has 4 divisors (see below), whose sum is σ = 55308532. Its totient is φ = 55247472.

The previous prime is 55277987. The next prime is 55278023. The reversal of 55278001 is 10087255.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49280400 + 5997601 = 7020^2 + 2449^2 .

It is a cyclic number.

It is not a de Polignac number, because 55278001 - 2²¹ = 53180849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55278061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12366 + ... + 16231.

It is an arithmetic number, because the mean of its divisors is an integer number (13827133).

Almost surely, 2^55278001 is an apocalyptic number.

It is an amenable number.

55278001 is a deficient number, since it is larger than the sum of its proper divisors (30531).

55278001 is a wasteful number, since it uses less digits than its factorization.

55278001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30530.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 55278001 is about 7434.9176861617. The cubic root of 55278001 is about 380.9349117141.

The spelling of 55278001 in words is "fifty-five million, two hundred seventy-eight thousand, one".