55087489 has 4 divisors (see below), whose sum is σ = 55121220. Its totient is φ = 55053760.

The previous prime is 55087471. The next prime is 55087519. The reversal of 55087489 is 98478055.

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 14025025 + 41062464 = 3745^2 + 6408^2 .

It is a cyclic number.

It is not a de Polignac number, because 55087489 - 2¹¹ = 55085441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55087469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14284 + ... + 17725.

It is an arithmetic number, because the mean of its divisors is an integer number (13780305).

Almost surely, 2^55087489 is an apocalyptic number.

It is an amenable number.

55087489 is a deficient number, since it is larger than the sum of its proper divisors (33731).

55087489 is a wasteful number, since it uses less digits than its factorization.

55087489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33730.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 55087489 is about 7422.0946504339. The cubic root of 55087489 is about 380.4967856187.

The spelling of 55087489 in words is "fifty-five million, eighty-seven thousand, four hundred eighty-nine".