147781121 has 2 divisors, whose sum is σ = 147781122. Its totient is φ = 147781120.

The previous prime is 147781111. The next prime is 147781157. The reversal of 147781121 is 121187741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142468096 + 5313025 = 11936^2 + 2305^2 .

It is an emirp because it is prime and its reverse (121187741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147781121 - 2⁶ = 147781057 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 (147781111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73890560 + 73890561.

It is an arithmetic number, because the mean of its divisors is an integer number (73890561).

Almost surely, 2^147781121 is an apocalyptic number.

It is an amenable number.

147781121 is a deficient number, since it is larger than the sum of its proper divisors (1).

147781121 is an equidigital number, since it uses as much as digits as its factorization.

147781121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 32.

The square root of 147781121 is about 12156.5258606232. The cubic root of 147781121 is about 528.6963581810.

The spelling of 147781121 in words is "one hundred forty-seven million, seven hundred eighty-one thousand, one hundred twenty-one".