857228501 has 2 divisors, whose sum is σ = 857228502. Its totient is φ = 857228500.

The previous prime is 857228497. The next prime is 857228507. The reversal of 857228501 is 105822758.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 761208100 + 96020401 = 27590^2 + 9799^2 .

It is a cyclic number.

It is not a de Polignac number, because 857228501 - 2² = 857228497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857228507) 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, 428614250 + 428614251.

It is an arithmetic number, because the mean of its divisors is an integer number (428614251).

Almost surely, 2^857228501 is an apocalyptic number.

It is an amenable number.

857228501 is a deficient number, since it is larger than the sum of its proper divisors (1).

857228501 is an equidigital number, since it uses as much as digits as its factorization.

857228501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 857228501 is about 29278.4647992343. The cubic root of 857228501 is about 949.9458883306.

It can be divided in two parts, 8572 and 28501, that added together give a palindrome (37073).

The spelling of 857228501 in words is "eight hundred fifty-seven million, two hundred twenty-eight thousand, five hundred one".