124993861 has 2 divisors, whose sum is σ = 124993862. Its totient is φ = 124993860.

The previous prime is 124993859. The next prime is 124993931. The reversal of 124993861 is 168399421.

124993861 = 7905² + 7906².

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62504836 + 62489025 = 7906^2 + 7905^2 .

It is a cyclic number.

It is not a de Polignac number, because 124993861 - 2¹ = 124993859 is a prime.

Together with 124993859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124993811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62496930 + 62496931.

It is an arithmetic number, because the mean of its divisors is an integer number (62496931).

Almost surely, 2^124993861 is an apocalyptic number.

124993861 is the 7906-th centered square number.

It is an amenable number.

124993861 is a deficient number, since it is larger than the sum of its proper divisors (1).

124993861 is an equidigital number, since it uses as much as digits as its factorization.

124993861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 124993861 is about 11180.0653397017. The cubic root of 124993861 is about 499.9918145327.

The spelling of 124993861 in words is "one hundred twenty-four million, nine hundred ninety-three thousand, eight hundred sixty-one".