147210809 has 2 divisors, whose sum is σ = 147210810. Its totient is φ = 147210808.

The previous prime is 147210781. The next prime is 147210821. The reversal of 147210809 is 908012741.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109265209 + 37945600 = 10453^2 + 6160^2 .

It is a cyclic number.

It is not a de Polignac number, because 147210809 - 2²⁴ = 130433593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (147210829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73605404 + 73605405.

It is an arithmetic number, because the mean of its divisors is an integer number (73605405).

Almost surely, 2^147210809 is an apocalyptic number.

It is an amenable number.

147210809 is a deficient number, since it is larger than the sum of its proper divisors (1).

147210809 is an equidigital number, since it uses as much as digits as its factorization.

147210809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 147210809 is about 12133.0461550264. The cubic root of 147210809 is about 528.0153722663.

The spelling of 147210809 in words is "one hundred forty-seven million, two hundred ten thousand, eight hundred nine".