231919 has 2 divisors, whose sum is σ = 231920. Its totient is φ = 231918.

The previous prime is 231901. The next prime is 231923. The reversal of 231919 is 919132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231919 - 2¹⁵ = 199151 is a prime.

It is a super-2 number, since 2×231919² = 107572845122, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 231893 and 231902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115959 + 115960.

It is an arithmetic number, because the mean of its divisors is an integer number (115960).

2²³¹⁹¹⁹ is an apocalyptic number.

231919 is a deficient number, since it is larger than the sum of its proper divisors (1).

231919 is an equidigital number, since it uses as much as digits as its factorization.

231919 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 231919 is about 481.5796922629. The cubic root of 231919 is about 61.4391845991.

Multiplying 231919 by its sum of digits (25), we get a palindrome (5797975).

The spelling of 231919 in words is "two hundred thirty-one thousand, nine hundred nineteen".