55867551 has 4 divisors (see below), whose sum is σ = 74490072. Its totient is φ = 37245032.

The previous prime is 55867547. The next prime is 55867561. The reversal of 55867551 is 15576855.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55867551 - 2² = 55867547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55867501) 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, 9311256 + ... + 9311261.

It is an arithmetic number, because the mean of its divisors is an integer number (18622518).

Almost surely, 2^55867551 is an apocalyptic number.

55867551 is a deficient number, since it is larger than the sum of its proper divisors (18622521).

55867551 is a wasteful number, since it uses less digits than its factorization.

55867551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18622520.

The product of its digits is 210000, while the sum is 42.

The square root of 55867551 is about 7474.4599135991. The cubic root of 55867551 is about 382.2843724647.

The spelling of 55867551 in words is "fifty-five million, eight hundred sixty-seven thousand, five hundred fifty-one".