55809951 has 16 divisors (see below), whose sum is σ = 77015040. Its totient is φ = 35912160.

The previous prime is 55809931. The next prime is 55809953. The reversal of 55809951 is 15990855.

It is a happy number.

It is not a de Polignac number, because 55809951 - 2¹¹ = 55807903 is a prime.

It is a super-2 number, since 2×55809951² = 6229501261244802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55809953) 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 15 ways as a sum of consecutive naturals, for example, 60270 + ... + 61188.

It is an arithmetic number, because the mean of its divisors is an integer number (4813440).

Almost surely, 2^55809951 is an apocalyptic number.

55809951 is a deficient number, since it is larger than the sum of its proper divisors (21205089).

55809951 is a wasteful number, since it uses less digits than its factorization.

55809951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606.

The product of its (nonzero) digits is 81000, while the sum is 42.

The square root of 55809951 is about 7470.6057987288. The cubic root of 55809951 is about 382.1529476259.

The spelling of 55809951 in words is "fifty-five million, eight hundred nine thousand, nine hundred fifty-one".