919381 has 2 divisors, whose sum is σ = 919382. Its totient is φ = 919380.

The previous prime is 919351. The next prime is 919393. The reversal of 919381 is 183919.

919381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 731025 + 188356 = 855^2 + 434^2 .

It is an emirp because it is prime and its reverse (183919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 919381 - 2⁵ = 919349 is a prime.

It is a super-2 number, since 2×919381² = 1690522846322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459690 + 459691.

It is an arithmetic number, because the mean of its divisors is an integer number (459691).

2⁹¹⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

919381 is a deficient number, since it is larger than the sum of its proper divisors (1).

919381 is an equidigital number, since it uses as much as digits as its factorization.

919381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 919381 is about 958.8435743123. The cubic root of 919381 is about 97.2370649569.

The spelling of 919381 in words is "nine hundred nineteen thousand, three hundred eighty-one".