55909207 has 4 divisors (see below), whose sum is σ = 55995480. Its totient is φ = 55822936.

The previous prime is 55909193. The next prime is 55909219. The reversal of 55909207 is 70290955.

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 55909207 - 2¹⁹ = 55384919 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 (55909237) 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, 42157 + ... + 43462.

It is an arithmetic number, because the mean of its divisors is an integer number (13998870).

Almost surely, 2^55909207 is an apocalyptic number.

55909207 is a deficient number, since it is larger than the sum of its proper divisors (86273).

55909207 is an equidigital number, since it uses as much as digits as its factorization.

55909207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86272.

The product of its (nonzero) digits is 28350, while the sum is 37.

The square root of 55909207 is about 7477.2459502146. The cubic root of 55909207 is about 382.3793619014.

The spelling of 55909207 in words is "fifty-five million, nine hundred nine thousand, two hundred seven".