55406517 has 16 divisors (see below), whose sum is σ = 79577088. Its totient is φ = 34190640.

The previous prime is 55406513. The next prime is 55406557. The reversal of 55406517 is 71560455.

It is not a de Polignac number, because 55406517 - 2² = 55406513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55406513) 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, 10813 + ... + 15090.

It is an arithmetic number, because the mean of its divisors is an integer number (4973568).

Almost surely, 2^55406517 is an apocalyptic number.

It is an amenable number.

55406517 is a deficient number, since it is larger than the sum of its proper divisors (24170571).

55406517 is a wasteful number, since it uses less digits than its factorization.

55406517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25960.

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 55406517 is about 7443.5554004790. Note that the first 3 decimals coincide. The cubic root of 55406517 is about 381.2298954910.

The spelling of 55406517 in words is "fifty-five million, four hundred six thousand, five hundred seventeen".