847391213 has 2 divisors, whose sum is σ = 847391214. Its totient is φ = 847391212.

The previous prime is 847391147. The next prime is 847391257. The reversal of 847391213 is 312193748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 735602884 + 111788329 = 27122^2 + 10573^2 .

It is a cyclic number.

It is not a de Polignac number, because 847391213 - 2¹⁰ = 847390189 is a prime.

It is a super-5 number, since 5×847391213⁵ (a number of 46 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (847391263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423695606 + 423695607.

It is an arithmetic number, because the mean of its divisors is an integer number (423695607).

Almost surely, 2^847391213 is an apocalyptic number.

It is an amenable number.

847391213 is a deficient number, since it is larger than the sum of its proper divisors (1).

847391213 is an equidigital number, since it uses as much as digits as its factorization.

847391213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 847391213 is about 29109.9847646817. The cubic root of 847391213 is about 946.2981377450.

The spelling of 847391213 in words is "eight hundred forty-seven million, three hundred ninety-one thousand, two hundred thirteen".