55442869 has 4 divisors (see below), whose sum is σ = 55489644. Its totient is φ = 55396096.

The previous prime is 55442833. The next prime is 55442873. The reversal of 55442869 is 96824455.

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 21068100 + 34374769 = 4590^2 + 5863^2 .

It is a cyclic number.

It is not a de Polignac number, because 55442869 - 2⁹ = 55442357 is a prime.

It is a super-2 number, since 2×55442869² = 6147823445902322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55442819) 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, 21562 + ... + 23995.

It is an arithmetic number, because the mean of its divisors is an integer number (13872411).

Almost surely, 2^55442869 is an apocalyptic number.

It is an amenable number.

55442869 is a deficient number, since it is larger than the sum of its proper divisors (46775).

55442869 is a wasteful number, since it uses less digits than its factorization.

55442869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46774.

The product of its digits is 345600, while the sum is 43.

The square root of 55442869 is about 7445.9968439424. The cubic root of 55442869 is about 381.3132517469.

The spelling of 55442869 in words is "fifty-five million, four hundred forty-two thousand, eight hundred sixty-nine".