147776561 has 8 divisors (see below), whose sum is σ = 151583400. Its totient is φ = 144007552.

The previous prime is 147776549. The next prime is 147776591. The reversal of 147776561 is 165677741.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27457600 + 120318961 = 5240^2 + 10969^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 147776561 - 2¹⁴ = 147760177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147776591) 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 in 7 ways as a sum of consecutive naturals, for example, 1460 + ... + 17253.

It is an arithmetic number, because the mean of its divisors is an integer number (18947925).

Almost surely, 2^147776561 is an apocalyptic number.

It is an amenable number.

147776561 is a deficient number, since it is larger than the sum of its proper divisors (3806839).

147776561 is a wasteful number, since it uses less digits than its factorization.

147776561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18915.

The product of its digits is 246960, while the sum is 44.

The square root of 147776561 is about 12156.3383055919. The cubic root of 147776561 is about 528.6909202284.

The spelling of 147776561 in words is "one hundred forty-seven million, seven hundred seventy-six thousand, five hundred sixty-one".