124828991981 has 2 divisors, whose sum is σ = 124828991982. Its totient is φ = 124828991980.

The previous prime is 124828991933. The next prime is 124828992037. The reversal of 124828991981 is 189199828421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110799773956 + 14029218025 = 332866^2 + 118445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124828991981 is a prime.

It is a super-2 number, since 2×124828991981² (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 (124828991381) 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, 62414495990 + 62414495991.

It is an arithmetic number, because the mean of its divisors is an integer number (62414495991).

Almost surely, 2^124828991981 is an apocalyptic number.

It is an amenable number.

124828991981 is a deficient number, since it is larger than the sum of its proper divisors (1).

124828991981 is an equidigital number, since it uses as much as digits as its factorization.

124828991981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 62.

The spelling of 124828991981 in words is "one hundred twenty-four billion, eight hundred twenty-eight million, nine hundred ninety-one thousand, nine hundred eighty-one".