124520009 has 2 divisors, whose sum is σ = 124520010. Its totient is φ = 124520008.

The previous prime is 124519991. The next prime is 124520017. The reversal of 124520009 is 900025421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80496784 + 44023225 = 8972^2 + 6635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124520009 is a prime.

It is not a weakly prime, because it can be changed into another prime (124520029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62260004 + 62260005.

It is an arithmetic number, because the mean of its divisors is an integer number (62260005).

Almost surely, 2^124520009 is an apocalyptic number.

It is an amenable number.

124520009 is a deficient number, since it is larger than the sum of its proper divisors (1).

124520009 is an equidigital number, since it uses as much as digits as its factorization.

124520009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 124520009 is about 11158.8533909179. The cubic root of 124520009 is about 499.3591910787.

The spelling of 124520009 in words is "one hundred twenty-four million, five hundred twenty thousand, nine".