55378997 has 4 divisors (see below), whose sum is σ = 55425216. Its totient is φ = 55332780.

The previous prime is 55378957. The next prime is 55379021. The reversal of 55378997 is 79987355.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55378997 - 2¹⁴ = 55362613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55378957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21263 + ... + 23724.

It is an arithmetic number, because the mean of its divisors is an integer number (13856304).

Almost surely, 2^55378997 is an apocalyptic number.

It is an amenable number.

55378997 is a deficient number, since it is larger than the sum of its proper divisors (46219).

55378997 is a wasteful number, since it uses less digits than its factorization.

55378997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46218.

The product of its digits is 2381400, while the sum is 53.

The square root of 55378997 is about 7441.7065919048. The cubic root of 55378997 is about 381.1667670313.

The spelling of 55378997 in words is "fifty-five million, three hundred seventy-eight thousand, nine hundred ninety-seven".