55991206 has 4 divisors (see below), whose sum is σ = 83986812. Its totient is φ = 27995602.

The previous prime is 55991197. The next prime is 55991209. The reversal of 55991206 is 60219955.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55991209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13997800 + ... + 13997803.

It is an arithmetic number, because the mean of its divisors is an integer number (20996703).

Almost surely, 2^55991206 is an apocalyptic number.

55991206 is a deficient number, since it is larger than the sum of its proper divisors (27995606).

55991206 is a wasteful number, since it uses less digits than its factorization.

55991206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27995605.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 55991206 is about 7482.7271766382. The cubic root of 55991206 is about 382.5662089384.

The spelling of 55991206 in words is "fifty-five million, nine hundred ninety-one thousand, two hundred six".