52691809 has 2 divisors, whose sum is σ = 52691810. Its totient is φ = 52691808.

The previous prime is 52691791. The next prime is 52691831. The reversal of 52691809 is 90819625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49280400 + 3411409 = 7020^2 + 1847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52691809 is a prime.

It is not a weakly prime, because it can be changed into another prime (52691209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26345904 + 26345905.

It is an arithmetic number, because the mean of its divisors is an integer number (26345905).

Almost surely, 2^52691809 is an apocalyptic number.

It is an amenable number.

52691809 is a deficient number, since it is larger than the sum of its proper divisors (1).

52691809 is an equidigital number, since it uses as much as digits as its factorization.

52691809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 52691809 is about 7258.9123840972. The cubic root of 52691809 is about 374.8990756553.

The spelling of 52691809 in words is "fifty-two million, six hundred ninety-one thousand, eight hundred nine".