1928561 has 2 divisors, whose sum is σ = 1928562. Its totient is φ = 1928560.

The previous prime is 1928543. The next prime is 1928567. The reversal of 1928561 is 1658291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1849600 + 78961 = 1360^2 + 281^2 .

It is an emirp because it is prime and its reverse (1658291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1928561 - 2¹⁰ = 1927537 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1928567) 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, 964280 + 964281.

It is an arithmetic number, because the mean of its divisors is an integer number (964281).

2^1928561 is an apocalyptic number.

It is an amenable number.

1928561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928561 is an equidigital number, since it uses as much as digits as its factorization.

1928561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 1928561 is about 1388.7263949389. The cubic root of 1928561 is about 124.4737556440.

The spelling of 1928561 in words is "one million, nine hundred twenty-eight thousand, five hundred sixty-one".