1921417 has 2 divisors, whose sum is σ = 1921418. Its totient is φ = 1921416.

The previous prime is 1921393. The next prime is 1921427. The reversal of 1921417 is 7141291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1713481 + 207936 = 1309^2 + 456^2 .

It is an emirp because it is prime and its reverse (7141291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1921417 - 2¹¹ = 1919369 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1921391 and 1921400.

It is not a weakly prime, because it can be changed into another prime (1921427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960708 + 960709.

It is an arithmetic number, because the mean of its divisors is an integer number (960709).

2^1921417 is an apocalyptic number.

It is an amenable number.

1921417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921417 is an equidigital number, since it uses as much as digits as its factorization.

1921417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 25.

The square root of 1921417 is about 1386.1518675816. The cubic root of 1921417 is about 124.3198687503.

The spelling of 1921417 in words is "one million, nine hundred twenty-one thousand, four hundred seventeen".