55005531 has 16 divisors (see below), whose sum is σ = 83940864. Its totient is φ = 31385664.

The previous prime is 55005521. The next prime is 55005553. The reversal of 55005531 is 13550055.

It is not a de Polignac number, because 55005531 - 2¹⁰ = 55004507 is a prime.

It is a super-2 number, since 2×55005531² = 6051216881183922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55005521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17151 + ... + 20103.

It is an arithmetic number, because the mean of its divisors is an integer number (5246304).

Almost surely, 2^55005531 is an apocalyptic number.

55005531 is a deficient number, since it is larger than the sum of its proper divisors (28935333).

55005531 is a wasteful number, since it uses less digits than its factorization.

55005531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850.

The product of its (nonzero) digits is 1875, while the sum is 24.

The square root of 55005531 is about 7416.5713776650. The cubic root of 55005531 is about 380.3079936064.

Adding to 55005531 its reverse (13550055), we get a palindrome (68555586).

The spelling of 55005531 in words is "fifty-five million, five thousand, five hundred thirty-one".