147820181 has 2 divisors, whose sum is σ = 147820182. Its totient is φ = 147820180.

The previous prime is 147820177. The next prime is 147820201. The reversal of 147820181 is 181028741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134351281 + 13468900 = 11591^2 + 3670^2 .

It is an emirp because it is prime and its reverse (181028741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147820181 - 2² = 147820177 is a prime.

It is a super-2 number, since 2×147820181² = 43701611821745522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147826181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73910090 + 73910091.

It is an arithmetic number, because the mean of its divisors is an integer number (73910091).

Almost surely, 2^147820181 is an apocalyptic number.

It is an amenable number.

147820181 is a deficient number, since it is larger than the sum of its proper divisors (1).

147820181 is an equidigital number, since it uses as much as digits as its factorization.

147820181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 147820181 is about 12158.1322990005. The cubic root of 147820181 is about 528.7429339558.

The spelling of 147820181 in words is "one hundred forty-seven million, eight hundred twenty thousand, one hundred eighty-one".