851522281 has 2 divisors, whose sum is σ = 851522282. Its totient is φ = 851522280.

The previous prime is 851522251. The next prime is 851522293. The reversal of 851522281 is 182225158.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654541056 + 196981225 = 25584^2 + 14035^2 .

It is a cyclic number.

It is not a de Polignac number, because 851522281 - 2¹¹ = 851520233 is a prime.

It is a super-2 number, since 2×851522281² = 1450180390078885922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (851522251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425761140 + 425761141.

It is an arithmetic number, because the mean of its divisors is an integer number (425761141).

Almost surely, 2^851522281 is an apocalyptic number.

It is an amenable number.

851522281 is a deficient number, since it is larger than the sum of its proper divisors (1).

851522281 is an equidigital number, since it uses as much as digits as its factorization.

851522281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12800, while the sum is 34.

The square root of 851522281 is about 29180.8546996143. The cubic root of 851522281 is about 947.8333934427.

The spelling of 851522281 in words is "eight hundred fifty-one million, five hundred twenty-two thousand, two hundred eighty-one".