55422161 has 4 divisors (see below), whose sum is σ = 57333300. Its totient is φ = 53511024.

The previous prime is 55422151. The next prime is 55422167. The reversal of 55422161 is 16122455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16122455 = 5 ⋅3224491.

It can be written as a sum of positive squares in 2 ways, for example, as 29767936 + 25654225 = 5456^2 + 5065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55422161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55422161.

It is not an unprimeable number, because it can be changed into a prime (55422167) 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, 955526 + ... + 955583.

It is an arithmetic number, because the mean of its divisors is an integer number (14333325).

Almost surely, 2^55422161 is an apocalyptic number.

It is an amenable number.

55422161 is a deficient number, since it is larger than the sum of its proper divisors (1911139).

55422161 is a wasteful number, since it uses less digits than its factorization.

55422161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911138.

The product of its digits is 2400, while the sum is 26.

The square root of 55422161 is about 7444.6061682268. The cubic root of 55422161 is about 381.2657721326.

The spelling of 55422161 in words is "fifty-five million, four hundred twenty-two thousand, one hundred sixty-one".