5123640209 has 2 divisors, whose sum is σ = 5123640210. Its totient is φ = 5123640208.

The previous prime is 5123640169. The next prime is 5123640229. The reversal of 5123640209 is 9020463215.

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., 5066592400 + 57047809 = 71180^2 + 7553^2 .

It is a cyclic number.

It is not a de Polignac number, because 5123640209 - 2¹² = 5123636113 is a prime.

It is not a weakly prime, because it can be changed into another prime (5123640229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2561820104 + 2561820105.

It is an arithmetic number, because the mean of its divisors is an integer number (2561820105).

Almost surely, 2^5123640209 is an apocalyptic number.

It is an amenable number.

5123640209 is a deficient number, since it is larger than the sum of its proper divisors (1).

5123640209 is an equidigital number, since it uses as much as digits as its factorization.

5123640209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 5123640209 is about 71579.6074940342. The cubic root of 5123640209 is about 1723.9561236216.

The spelling of 5123640209 in words is "five billion, one hundred twenty-three million, six hundred forty thousand, two hundred nine".