55071557 has 4 divisors (see below), whose sum is σ = 57970080. Its totient is φ = 52173036.

The previous prime is 55071553. The next prime is 55071559. The reversal of 55071557 is 75517055.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75517055 = 5 ⋅15103411.

It is a cyclic number.

It is not a de Polignac number, because 55071557 - 2² = 55071553 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 (55071553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1449233 + ... + 1449270.

It is an arithmetic number, because the mean of its divisors is an integer number (14492520).

Almost surely, 2^55071557 is an apocalyptic number.

It is an amenable number.

55071557 is a deficient number, since it is larger than the sum of its proper divisors (2898523).

55071557 is a wasteful number, since it uses less digits than its factorization.

55071557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898522.

The product of its (nonzero) digits is 30625, while the sum is 35.

The square root of 55071557 is about 7421.0212909006. The cubic root of 55071557 is about 380.4601005842.

The spelling of 55071557 in words is "fifty-five million, seventy-one thousand, five hundred fifty-seven".