84722257 has 2 divisors, whose sum is σ = 84722258. Its totient is φ = 84722256.

The previous prime is 84722251. The next prime is 84722263. The reversal of 84722257 is 75222748.

It is a balanced prime because it is at equal distance from previous prime (84722251) and next prime (84722263).

It can be written as a sum of positive squares in only one way, i.e., 43877376 + 40844881 = 6624^2 + 6391^2 .

It is a cyclic number.

It is not a de Polignac number, because 84722257 - 2⁷ = 84722129 is a prime.

It is a super-4 number, since 4×84722257⁴ (a number of 33 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (84722251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42361128 + 42361129.

It is an arithmetic number, because the mean of its divisors is an integer number (42361129).

Almost surely, 2^84722257 is an apocalyptic number.

It is an amenable number.

84722257 is a deficient number, since it is larger than the sum of its proper divisors (1).

84722257 is an equidigital number, since it uses as much as digits as its factorization.

84722257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 37.

The square root of 84722257 is about 9204.4694035018. The cubic root of 84722257 is about 439.2035471422.

It can be divided in two parts, 847 and 22257, that added together give a square (23104 = 152²).

The spelling of 84722257 in words is "eighty-four million, seven hundred twenty-two thousand, two hundred fifty-seven".