147206561 has 2 divisors, whose sum is σ = 147206562. Its totient is φ = 147206560.

The previous prime is 147206531. The next prime is 147206567. The reversal of 147206561 is 165602741.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146870161 + 336400 = 12119^2 + 580^2 .

It is an emirp because it is prime and its reverse (165602741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147206561 - 2²² = 143012257 is a prime.

It is not a weakly prime, because it can be changed into another prime (147206567) 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, 73603280 + 73603281.

It is an arithmetic number, because the mean of its divisors is an integer number (73603281).

Almost surely, 2^147206561 is an apocalyptic number.

It is an amenable number.

147206561 is a deficient number, since it is larger than the sum of its proper divisors (1).

147206561 is an equidigital number, since it uses as much as digits as its factorization.

147206561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 147206561 is about 12132.8710946750. The cubic root of 147206561 is about 528.0102933121.

The spelling of 147206561 in words is "one hundred forty-seven million, two hundred six thousand, five hundred sixty-one".