55011857 has 4 divisors (see below), whose sum is σ = 55189056. Its totient is φ = 54834660.

The previous prime is 55011841. The next prime is 55011871. The reversal of 55011857 is 75811055.

It is a happy number.

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 not a de Polignac number, because 55011857 - 2⁴ = 55011841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55011157) 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, 88133 + ... + 88754.

It is an arithmetic number, because the mean of its divisors is an integer number (13797264).

Almost surely, 2^55011857 is an apocalyptic number.

It is an amenable number.

55011857 is a deficient number, since it is larger than the sum of its proper divisors (177199).

55011857 is a wasteful number, since it uses less digits than its factorization.

55011857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177198.

The product of its (nonzero) digits is 7000, while the sum is 32.

The square root of 55011857 is about 7416.9978427933. The cubic root of 55011857 is about 380.3225723594.

Adding to 55011857 its sum of digits (32), we get a square (55011889 = 7417²).

The spelling of 55011857 in words is "fifty-five million, eleven thousand, eight hundred fifty-seven".