1921097 has 2 divisors, whose sum is σ = 1921098. Its totient is φ = 1921096.

The previous prime is 1921079. The next prime is 1921103. The reversal of 1921097 is 7901291.

Together with previous prime (1921079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1263376 + 657721 = 1124^2 + 811^2 .

It is an emirp because it is prime and its reverse (7901291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1921097 - 2¹² = 1917001 is a prime.

It is a super-2 number, since 2×1921097² = 7381227366818, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1921027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960548 + 960549.

It is an arithmetic number, because the mean of its divisors is an integer number (960549).

2^1921097 is an apocalyptic number.

It is an amenable number.

1921097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921097 is an equidigital number, since it uses as much as digits as its factorization.

1921097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 1921097 is about 1386.0364353075. The cubic root of 1921097 is about 124.3129668013.

The spelling of 1921097 in words is "one million, nine hundred twenty-one thousand, ninety-seven".