55451905 has 4 divisors (see below), whose sum is σ = 66542292. Its totient is φ = 44361520.

The previous prime is 55451843. The next prime is 55451911. The reversal of 55451905 is 50915455.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 27952369 = 5244^2 + 5287^2 .

It is not a de Polignac number, because 55451905 - 2¹¹ = 55449857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5545186 + ... + 5545195.

It is an arithmetic number, because the mean of its divisors is an integer number (16635573).

Almost surely, 2^55451905 is an apocalyptic number.

It is an amenable number.

55451905 is a deficient number, since it is larger than the sum of its proper divisors (11090387).

55451905 is a wasteful number, since it uses less digits than its factorization.

55451905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11090386.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 55451905 is about 7446.6035882139. The cubic root of 55451905 is about 381.3339659189. Note that the first 3 decimals are identical.

It can be divided in two parts, 55 and 451905, that multiplied together give a triangular number (24854775 = T₇₀₅₀).

The spelling of 55451905 in words is "fifty-five million, four hundred fifty-one thousand, nine hundred five".