55131611 has 4 divisors (see below), whose sum is σ = 56304672. Its totient is φ = 53958552.

The previous prime is 55131563. The next prime is 55131623. The reversal of 55131611 is 11613155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11613155 = 5 ⋅2322631.

It is a cyclic number.

It is not a de Polignac number, because 55131611 - 2¹⁴ = 55115227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55131631) 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, 586460 + ... + 586553.

It is an arithmetic number, because the mean of its divisors is an integer number (14076168).

Almost surely, 2^55131611 is an apocalyptic number.

55131611 is a deficient number, since it is larger than the sum of its proper divisors (1173061).

55131611 is a wasteful number, since it uses less digits than its factorization.

55131611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173060.

The product of its digits is 450, while the sum is 23.

The square root of 55131611 is about 7425.0663970095. The cubic root of 55131611 is about 380.5983440627.

Adding to 55131611 its reverse (11613155), we get a palindrome (66744766).

The spelling of 55131611 in words is "fifty-five million, one hundred thirty-one thousand, six hundred eleven".