857219249 has 2 divisors, whose sum is σ = 857219250. Its totient is φ = 857219248.

The previous prime is 857219227. The next prime is 857219263. The reversal of 857219249 is 942912758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855855025 + 1364224 = 29255^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 857219249 - 2²⁴ = 840442033 is a prime.

It is a super-2 number, since 2×857219249² = 1469649681712248002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (857219449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428609624 + 428609625.

It is an arithmetic number, because the mean of its divisors is an integer number (428609625).

Almost surely, 2^857219249 is an apocalyptic number.

It is an amenable number.

857219249 is a deficient number, since it is larger than the sum of its proper divisors (1).

857219249 is an equidigital number, since it uses as much as digits as its factorization.

857219249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 857219249 is about 29278.3067987204. The cubic root of 857219249 is about 949.9424707545.

The spelling of 857219249 in words is "eight hundred fifty-seven million, two hundred nineteen thousand, two hundred forty-nine".