1928161 has 2 divisors, whose sum is σ = 1928162. Its totient is φ = 1928160.

The previous prime is 1928141. The next prime is 1928167. The reversal of 1928161 is 1618291.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1742400 + 185761 = 1320^2 + 431^2 .

It is an emirp because it is prime and its reverse (1618291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1928161 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1928167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964080 + 964081.

It is an arithmetic number, because the mean of its divisors is an integer number (964081).

2^1928161 is an apocalyptic number.

It is an amenable number.

1928161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928161 is an equidigital number, since it uses as much as digits as its factorization.

1928161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 1928161 is about 1388.5823706212. The cubic root of 1928161 is about 124.4651494095.

The spelling of 1928161 in words is "one million, nine hundred twenty-eight thousand, one hundred sixty-one".