124278689 has 2 divisors, whose sum is σ = 124278690. Its totient is φ = 124278688.

The previous prime is 124278617. The next prime is 124278691. The reversal of 124278689 is 986872421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104387089 + 19891600 = 10217^2 + 4460^2 .

It is an emirp because it is prime and its reverse (986872421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124278689 - 2⁸ = 124278433 is a prime.

Together with 124278691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (124278589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62139344 + 62139345.

It is an arithmetic number, because the mean of its divisors is an integer number (62139345).

Almost surely, 2^124278689 is an apocalyptic number.

It is an amenable number.

124278689 is a deficient number, since it is larger than the sum of its proper divisors (1).

124278689 is an equidigital number, since it uses as much as digits as its factorization.

124278689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 47.

The square root of 124278689 is about 11148.0352080535. The cubic root of 124278689 is about 499.0363961281.

The spelling of 124278689 in words is "one hundred twenty-four million, two hundred seventy-eight thousand, six hundred eighty-nine".