55581101 has 4 divisors (see below), whose sum is σ = 55610400. Its totient is φ = 55551804.

The previous prime is 55581089. The next prime is 55581131. The reversal of 55581101 is 10118555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55581101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55581131) 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, 11591 + ... + 15668.

It is an arithmetic number, because the mean of its divisors is an integer number (13902600).

Almost surely, 2^55581101 is an apocalyptic number.

It is an amenable number.

55581101 is a deficient number, since it is larger than the sum of its proper divisors (29299).

55581101 is a wasteful number, since it uses less digits than its factorization.

55581101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29298.

The product of its (nonzero) digits is 1000, while the sum is 26.

The square root of 55581101 is about 7455.2733685627. The cubic root of 55581101 is about 381.6298896908.

Adding to 55581101 its reverse (10118555), we get a palindrome (65699656).

The spelling of 55581101 in words is "fifty-five million, five hundred eighty-one thousand, one hundred one".