118681231 has 2 divisors, whose sum is σ = 118681232. Its totient is φ = 118681230.

The previous prime is 118681217. The next prime is 118681243. The reversal of 118681231 is 132186811.

It is a strong prime.

It is an emirp because it is prime and its reverse (132186811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118681231 - 2⁷ = 118681103 is a prime.

It is a super-2 number, since 2×118681231² = 28170469183350722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 118681193 and 118681202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118681261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59340615 + 59340616.

It is an arithmetic number, because the mean of its divisors is an integer number (59340616).

Almost surely, 2^118681231 is an apocalyptic number.

118681231 is a deficient number, since it is larger than the sum of its proper divisors (1).

118681231 is an equidigital number, since it uses as much as digits as its factorization.

118681231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 31.

The square root of 118681231 is about 10894.0915637790. The cubic root of 118681231 is about 491.4288862422.

The spelling of 118681231 in words is "one hundred eighteen million, six hundred eighty-one thousand, two hundred thirty-one".