124040999981 has 2 divisors, whose sum is σ = 124040999982. Its totient is φ = 124040999980.

The previous prime is 124040999947. The next prime is 124041000019. The reversal of 124040999981 is 189999040421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91376221225 + 32664778756 = 302285^2 + 180734^2 .

It is a cyclic number.

It is not a de Polignac number, because 124040999981 - 2¹⁸ = 124040737837 is a prime.

It is a super-2 number, since 2×124040999981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124040899981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62020499990 + 62020499991.

It is an arithmetic number, because the mean of its divisors is an integer number (62020499991).

Almost surely, 2^124040999981 is an apocalyptic number.

It is an amenable number.

124040999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

124040999981 is an equidigital number, since it uses as much as digits as its factorization.

124040999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 56.

The spelling of 124040999981 in words is "one hundred twenty-four billion, forty million, nine hundred ninety-nine thousand, nine hundred eighty-one".