55531985 has 4 divisors (see below), whose sum is σ = 66638388. Its totient is φ = 44425584.

The previous prime is 55531937. The next prime is 55532017. The reversal of 55531985 is 58913555.

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 11282881 + 44249104 = 3359^2 + 6652^2 .

It is a cyclic number.

It is not a de Polignac number, because 55531985 - 2²⁴ = 38754769 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, 5553194 + ... + 5553203.

It is an arithmetic number, because the mean of its divisors is an integer number (16659597).

Almost surely, 2^55531985 is an apocalyptic number.

It is an amenable number.

55531985 is a deficient number, since it is larger than the sum of its proper divisors (11106403).

55531985 is a wasteful number, since it uses less digits than its factorization.

55531985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11106402.

The product of its digits is 135000, while the sum is 41.

The square root of 55531985 is about 7451.9785963192. The cubic root of 55531985 is about 381.5174434497.

The spelling of 55531985 in words is "fifty-five million, five hundred thirty-one thousand, nine hundred eighty-five".