231434981 has 2 divisors, whose sum is σ = 231434982. Its totient is φ = 231434980.

The previous prime is 231434927. The next prime is 231435019. The reversal of 231434981 is 189434132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157904356 + 73530625 = 12566^2 + 8575^2 .

It is a cyclic number.

It is not a de Polignac number, because 231434981 - 2¹⁰ = 231433957 is a prime.

It is a super-2 number, since 2×231434981² = 107124300860940722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231434911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115717490 + 115717491.

It is an arithmetic number, because the mean of its divisors is an integer number (115717491).

Almost surely, 2^231434981 is an apocalyptic number.

It is an amenable number.

231434981 is a deficient number, since it is larger than the sum of its proper divisors (1).

231434981 is an equidigital number, since it uses as much as digits as its factorization.

231434981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 231434981 is about 15212.9872477433. The cubic root of 231434981 is about 613.9641328028.

The spelling of 231434981 in words is "two hundred thirty-one million, four hundred thirty-four thousand, nine hundred eighty-one".