523976309 has 2 divisors, whose sum is σ = 523976310. Its totient is φ = 523976308.

The previous prime is 523976303. The next prime is 523976311. The reversal of 523976309 is 903679325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 286354084 + 237622225 = 16922^2 + 15415^2 .

It is a cyclic number.

It is not a de Polignac number, because 523976309 - 2¹² = 523972213 is a prime.

Together with 523976311, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 523976309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523976303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261988154 + 261988155.

It is an arithmetic number, because the mean of its divisors is an integer number (261988155).

Almost surely, 2^523976309 is an apocalyptic number.

It is an amenable number.

523976309 is a deficient number, since it is larger than the sum of its proper divisors (1).

523976309 is an equidigital number, since it uses as much as digits as its factorization.

523976309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 44.

The square root of 523976309 is about 22890.5288055999. The cubic root of 523976309 is about 806.1896477549.

The spelling of 523976309 in words is "five hundred twenty-three million, nine hundred seventy-six thousand, three hundred nine".