856344253 has 2 divisors, whose sum is σ = 856344254. Its totient is φ = 856344252.

The previous prime is 856344199. The next prime is 856344259. The reversal of 856344253 is 352443658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562496089 + 293848164 = 23717^2 + 17142^2 .

It is a cyclic number.

It is not a de Polignac number, because 856344253 - 2¹⁷ = 856213181 is a prime.

It is a super-2 number, since 2×856344253² = 1466650959292256018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856344259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428172126 + 428172127.

It is an arithmetic number, because the mean of its divisors is an integer number (428172127).

Almost surely, 2^856344253 is an apocalyptic number.

It is an amenable number.

856344253 is a deficient number, since it is larger than the sum of its proper divisors (1).

856344253 is an equidigital number, since it uses as much as digits as its factorization.

856344253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 40.

The square root of 856344253 is about 29263.3602479278. The cubic root of 856344253 is about 949.6191466906.

The spelling of 856344253 in words is "eight hundred fifty-six million, three hundred forty-four thousand, two hundred fifty-three".