55136987 has 8 divisors (see below), whose sum is σ = 55708272. Its totient is φ = 54568800.

The previous prime is 55136953. The next prime is 55136989. The reversal of 55136987 is 78963155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55136987 - 2¹⁰ = 55135963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55136989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51437 + ... + 52497.

It is an arithmetic number, because the mean of its divisors is an integer number (6963534).

Almost surely, 2^55136987 is an apocalyptic number.

55136987 is a deficient number, since it is larger than the sum of its proper divisors (571285).

55136987 is a wasteful number, since it uses less digits than its factorization.

55136987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549.

The product of its digits is 226800, while the sum is 44.

The square root of 55136987 is about 7425.4284051494. The cubic root of 55136987 is about 380.6107146438.

The spelling of 55136987 in words is "fifty-five million, one hundred thirty-six thousand, nine hundred eighty-seven".