919231 has 2 divisors, whose sum is σ = 919232. Its totient is φ = 919230.

The previous prime is 919229. The next prime is 919249. The reversal of 919231 is 132919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 919231 - 2¹ = 919229 is a prime.

It is a super-2 number, since 2×919231² = 1689971262722, which contains 22 as substring.

Together with 919229, it forms a pair of twin primes.

It is equal to p₇₂₆₈₂ and since 919231 and 72682 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 919196 and 919205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (919031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459615 + 459616.

It is an arithmetic number, because the mean of its divisors is an integer number (459616).

2⁹¹⁹²³¹ is an apocalyptic number.

919231 is a deficient number, since it is larger than the sum of its proper divisors (1).

919231 is an equidigital number, since it uses as much as digits as its factorization.

919231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 25.

The square root of 919231 is about 958.7653518980. The cubic root of 919231 is about 97.2317764881.

The spelling of 919231 in words is "nine hundred nineteen thousand, two hundred thirty-one".