919421 has 2 divisors, whose sum is σ = 919422. Its totient is φ = 919420.

The previous prime is 919417. The next prime is 919423. The reversal of 919421 is 124919.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 912025 + 7396 = 955^2 + 86^2 .

It is an emirp because it is prime and its reverse (124919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 919421 - 2² = 919417 is a prime.

It is a Sophie Germain prime.

Together with 919423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459710 + 459711.

It is an arithmetic number, because the mean of its divisors is an integer number (459711).

2⁹¹⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

919421 is a deficient number, since it is larger than the sum of its proper divisors (1).

919421 is an equidigital number, since it uses as much as digits as its factorization.

919421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 919421 is about 958.8644325451. The cubic root of 919421 is about 97.2384751180.

The spelling of 919421 in words is "nine hundred nineteen thousand, four hundred twenty-one".