124123981 has 2 divisors, whose sum is σ = 124123982. Its totient is φ = 124123980.

The previous prime is 124123957. The next prime is 124124027. The reversal of 124123981 is 189321421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122301481 + 1822500 = 11059^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 124123981 - 2⁵ = 124123949 is a prime.

It is a super-2 number, since 2×124123981² = 30813525318576722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124123081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62061990 + 62061991.

It is an arithmetic number, because the mean of its divisors is an integer number (62061991).

Almost surely, 2^124123981 is an apocalyptic number.

It is an amenable number.

124123981 is a deficient number, since it is larger than the sum of its proper divisors (1).

124123981 is an equidigital number, since it uses as much as digits as its factorization.

124123981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 124123981 is about 11141.0942460783. The cubic root of 124123981 is about 498.8292354270.

The spelling of 124123981 in words is "one hundred twenty-four million, one hundred twenty-three thousand, nine hundred eighty-one".