147707221 has 2 divisors, whose sum is σ = 147707222. Its totient is φ = 147707220.

The previous prime is 147707207. The next prime is 147707269. The reversal of 147707221 is 122707741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98903025 + 48804196 = 9945^2 + 6986^2 .

It is a cyclic number.

It is not a de Polignac number, because 147707221 - 2²⁵ = 114152789 is a prime.

It is equal to p_8322655 and since 147707221 and 8322655 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147707921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73853610 + 73853611.

It is an arithmetic number, because the mean of its divisors is an integer number (73853611).

Almost surely, 2^147707221 is an apocalyptic number.

It is an amenable number.

147707221 is a deficient number, since it is larger than the sum of its proper divisors (1).

147707221 is an equidigital number, since it uses as much as digits as its factorization.

147707221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488, while the sum is 31.

The square root of 147707221 is about 12153.4859608262. The cubic root of 147707221 is about 528.6082161707.

The spelling of 147707221 in words is "one hundred forty-seven million, seven hundred seven thousand, two hundred twenty-one".