55391505 has 16 divisors (see below), whose sum is σ = 95444160. Its totient is φ = 27269568.

The previous prime is 55391489. The next prime is 55391543. The reversal of 55391505 is 50519355.

It is not a de Polignac number, because 55391505 - 2⁴ = 55391489 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141835 + ... + 142224.

It is an arithmetic number, because the mean of its divisors is an integer number (5965260).

Almost surely, 2^55391505 is an apocalyptic number.

It is an amenable number.

55391505 is a deficient number, since it is larger than the sum of its proper divisors (40052655).

55391505 is a wasteful number, since it uses less digits than its factorization.

55391505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284080.

The product of its (nonzero) digits is 16875, while the sum is 33.

The square root of 55391505 is about 7442.5469430834. The cubic root of 55391505 is about 381.1954618753.

The spelling of 55391505 in words is "fifty-five million, three hundred ninety-one thousand, five hundred five".