55621198 has 4 divisors (see below), whose sum is σ = 83431800. Its totient is φ = 27810598.

The previous prime is 55621193. The next prime is 55621201. The reversal of 55621198 is 89112655.

55621198 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89112655 = 5 ⋅17822531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55621193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13905298 + ... + 13905301.

It is an arithmetic number, because the mean of its divisors is an integer number (20857950).

Almost surely, 2^55621198 is an apocalyptic number.

55621198 is a deficient number, since it is larger than the sum of its proper divisors (27810602).

55621198 is a wasteful number, since it uses less digits than its factorization.

55621198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27810601.

The product of its digits is 21600, while the sum is 37.

The square root of 55621198 is about 7457.9620540735. The cubic root of 55621198 is about 381.7216387155.

The spelling of 55621198 in words is "fifty-five million, six hundred twenty-one thousand, one hundred ninety-eight".