1921123 has 2 divisors, whose sum is σ = 1921124. Its totient is φ = 1921122.

The previous prime is 1921103. The next prime is 1921133. The reversal of 1921123 is 3211291.

It is a strong prime.

It is an emirp because it is prime and its reverse (3211291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1921123 - 2¹⁷ = 1790051 is a prime.

It is a super-2 number, since 2×1921123² = 7381427162258, which contains 22 as substring.

1921123 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1921123.

It is not a weakly prime, because it can be changed into another prime (1921103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960561 + 960562.

It is an arithmetic number, because the mean of its divisors is an integer number (960562).

2^1921123 is an apocalyptic number.

1921123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921123 is an equidigital number, since it uses as much as digits as its factorization.

1921123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 19.

The square root of 1921123 is about 1386.0458145386. The cubic root of 1921123 is about 124.3135276132.

The spelling of 1921123 in words is "one million, nine hundred twenty-one thousand, one hundred twenty-three".