147661861 has 2 divisors, whose sum is σ = 147661862. Its totient is φ = 147661860.

The previous prime is 147661859. The next prime is 147661873. The reversal of 147661861 is 168166741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115240225 + 32421636 = 10735^2 + 5694^2 .

It is a cyclic number.

It is not a de Polignac number, because 147661861 - 2¹ = 147661859 is a prime.

Together with 147661859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (147661841) 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, 73830930 + 73830931.

It is an arithmetic number, because the mean of its divisors is an integer number (73830931).

Almost surely, 2^147661861 is an apocalyptic number.

It is an amenable number.

147661861 is a deficient number, since it is larger than the sum of its proper divisors (1).

147661861 is an equidigital number, since it uses as much as digits as its factorization.

147661861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 147661861 is about 12151.6196862805. The cubic root of 147661861 is about 528.5540998284.

The spelling of 147661861 in words is "one hundred forty-seven million, six hundred sixty-one thousand, eight hundred sixty-one".