55405925 has 6 divisors (see below), whose sum is σ = 68703378. Its totient is φ = 44324720.

The previous prime is 55405901. The next prime is 55405943. The reversal of 55405925 is 52950455.

It can be written as a sum of positive squares in 3 ways, for example, as 11303044 + 44102881 = 3362^2 + 6641^2 .

It is a de Polignac number, because none of the positive numbers 2^k-55405925 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1108094 + ... + 1108143.

It is an arithmetic number, because the mean of its divisors is an integer number (11450563).

Almost surely, 2^55405925 is an apocalyptic number.

It is an amenable number.

55405925 is a deficient number, since it is larger than the sum of its proper divisors (13297453).

55405925 is a wasteful number, since it uses less digits than its factorization.

55405925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216247 (or 2216242 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 55405925 is about 7443.5156344297. The cubic root of 55405925 is about 381.2285377150.

The spelling of 55405925 in words is "fifty-five million, four hundred five thousand, nine hundred twenty-five".