523145209 has 2 divisors, whose sum is σ = 523145210. Its totient is φ = 523145208.

The previous prime is 523145201. The next prime is 523145213. The reversal of 523145209 is 902541325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 519976809 + 3168400 = 22803^2 + 1780^2 .

It is a cyclic number.

It is not a de Polignac number, because 523145209 - 2³ = 523145201 is a prime.

It is not a weakly prime, because it can be changed into another prime (523145201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261572604 + 261572605.

It is an arithmetic number, because the mean of its divisors is an integer number (261572605).

Almost surely, 2^523145209 is an apocalyptic number.

It is an amenable number.

523145209 is a deficient number, since it is larger than the sum of its proper divisors (1).

523145209 is an equidigital number, since it uses as much as digits as its factorization.

523145209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 523145209 is about 22872.3678048426. The cubic root of 523145209 is about 805.7631788682.

The spelling of 523145209 in words is "five hundred twenty-three million, one hundred forty-five thousand, two hundred nine".