847272661 has 2 divisors, whose sum is σ = 847272662. Its totient is φ = 847272660.

The previous prime is 847272659. The next prime is 847272691. The reversal of 847272661 is 166272748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 709210161 + 138062500 = 26631^2 + 11750^2 .

It is a cyclic number.

It is not a de Polignac number, because 847272661 - 2¹ = 847272659 is a prime.

Together with 847272659, 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 (847272641) 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, 423636330 + 423636331.

It is an arithmetic number, because the mean of its divisors is an integer number (423636331).

Almost surely, 2^847272661 is an apocalyptic number.

It is an amenable number.

847272661 is a deficient number, since it is larger than the sum of its proper divisors (1).

847272661 is an equidigital number, since it uses as much as digits as its factorization.

847272661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 43.

The square root of 847272661 is about 29107.9484161973. The cubic root of 847272661 is about 946.2540059174.

The spelling of 847272661 in words is "eight hundred forty-seven million, two hundred seventy-two thousand, six hundred sixty-one".