55278031 has 4 divisors (see below), whose sum is σ = 57184200. Its totient is φ = 53371864.

The previous prime is 55278029. The next prime is 55278043. The reversal of 55278031 is 13087255.

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

It is a cyclic number.

It is not a de Polignac number, because 55278031 - 2¹ = 55278029 is a prime.

It is a super-2 number, since 2×55278031² = 6111321422473922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55277984 and 55278002.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953041 + ... + 953098.

It is an arithmetic number, because the mean of its divisors is an integer number (14296050).

Almost surely, 2^55278031 is an apocalyptic number.

55278031 is a deficient number, since it is larger than the sum of its proper divisors (1906169).

55278031 is a wasteful number, since it uses less digits than its factorization.

55278031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906168.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55278031 is about 7434.9197036686. The cubic root of 55278031 is about 380.9349806266.

The spelling of 55278031 in words is "fifty-five million, two hundred seventy-eight thousand, thirty-one".