55851569 has 4 divisors (see below), whose sum is σ = 55924596. Its totient is φ = 55778544.

The previous prime is 55851529. The next prime is 55851571. The reversal of 55851569 is 96515855.

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 11122225 + 44729344 = 3335^2 + 6688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55851569 is a prime.

It is a super-3 number, since 3×55851569³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55851529) 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, 35354 + ... + 36899.

It is an arithmetic number, because the mean of its divisors is an integer number (13981149).

Almost surely, 2^55851569 is an apocalyptic number.

It is an amenable number.

55851569 is a deficient number, since it is larger than the sum of its proper divisors (73027).

55851569 is an equidigital number, since it uses as much as digits as its factorization.

55851569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73026.

The product of its digits is 270000, while the sum is 44.

The square root of 55851569 is about 7473.3907297826. The cubic root of 55851569 is about 382.2479156938.

The spelling of 55851569 in words is "fifty-five million, eight hundred fifty-one thousand, five hundred sixty-nine".