911231 has 2 divisors, whose sum is σ = 911232. Its totient is φ = 911230.

The previous prime is 911227. The next prime is 911233. The reversal of 911231 is 132119.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 911231 - 2² = 911227 is a prime.

It is a super-2 number, since 2×911231² = 1660683870722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 911233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (911233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455615 + 455616.

It is an arithmetic number, because the mean of its divisors is an integer number (455616).

2⁹¹¹²³¹ is an apocalyptic number.

911231 is a deficient number, since it is larger than the sum of its proper divisors (1).

911231 is an equidigital number, since it uses as much as digits as its factorization.

911231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54, while the sum is 17.

The square root of 911231 is about 954.5842026767. The cubic root of 911231 is about 96.9488872318.

The spelling of 911231 in words is "nine hundred eleven thousand, two hundred thirty-one".