1921277 has 2 divisors, whose sum is σ = 1921278. Its totient is φ = 1921276.

The previous prime is 1921273. The next prime is 1921307. The reversal of 1921277 is 7721291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1811716 + 109561 = 1346^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1921277 - 2² = 1921273 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921273) 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, 960638 + 960639.

It is an arithmetic number, because the mean of its divisors is an integer number (960639).

2^1921277 is an apocalyptic number.

It is an amenable number.

1921277 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921277 is an equidigital number, since it uses as much as digits as its factorization.

1921277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 29.

The square root of 1921277 is about 1386.1013671446. The cubic root of 1921277 is about 124.3168492419.

The spelling of 1921277 in words is "one million, nine hundred twenty-one thousand, two hundred seventy-seven".