1954228161 has 4 divisors (see below), whose sum is σ = 2605637552. Its totient is φ = 1302818772.

The previous prime is 1954228153. The next prime is 1954228163. The reversal of 1954228161 is 1618224591.

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 not a de Polignac number, because 1954228161 - 2³ = 1954228153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1954228163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325704691 + ... + 325704696.

It is an arithmetic number, because the mean of its divisors is an integer number (651409388).

Almost surely, 2^1954228161 is an apocalyptic number.

It is an amenable number.

1954228161 is a deficient number, since it is larger than the sum of its proper divisors (651409391).

1954228161 is an equidigital number, since it uses as much as digits as its factorization.

1954228161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651409390.

The product of its digits is 34560, while the sum is 39.

The square root of 1954228161 is about 44206.6529042858. The cubic root of 1954228161 is about 1250.2352967189.

The spelling of 1954228161 in words is "one billion, nine hundred fifty-four million, two hundred twenty-eight thousand, one hundred sixty-one".