55990771 has 4 divisors (see below), whose sum is σ = 57182112.
Its totient is φ = 54799432.
The previous prime is 55990751. The next prime is 55990787. The reversal of 55990771 is 17709955.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17709955 = 5 ⋅3541991.
It is a cyclic number.
It is not a de Polignac number, because 55990771 - 213 = 55982579 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (55990751) 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, 595600 + ... + 595693.
It is an arithmetic number, because the mean of its divisors is an integer number (14295528).
Almost surely, 255990771 is an apocalyptic number.
55990771 is a deficient number, since it is larger than the sum of its proper divisors (1191341).
55990771 is a wasteful number, since it uses less digits than its factorization.
55990771 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1191340.
The product of its (nonzero) digits is 99225, while the sum is 43.
The square root of 55990771 is about 7482.6981096393.
The cubic root of 55990771 is about 382.5652182071.
The spelling of 55990771 in words is "fifty-five million, nine hundred ninety thousand, seven hundred seventy-one".