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84971521 is a prime number
BaseRepresentation
bin1010001000010…
…01000000000001
312220220000000101
411010021000001
5133223042041
612233122401
72051150245
oct504110001
9186800011
1084971521
1143a673a8
1224559401
13147b120b
14b3dc425
1576d6b31
hex5109001

84971521 has 2 divisors, whose sum is σ = 84971522. Its totient is φ = 84971520.

The previous prime is 84971519. The next prime is 84971567. The reversal of 84971521 is 12517948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 19927296 = 8065^2 + 4464^2 .

It is a cyclic number.

It is not a de Polignac number, because 84971521 - 21 = 84971519 is a prime.

Together with 84971519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (84971501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42485760 + 42485761.

It is an arithmetic number, because the mean of its divisors is an integer number (42485761).

Almost surely, 284971521 is an apocalyptic number.

It is an amenable number.

84971521 is a deficient number, since it is larger than the sum of its proper divisors (1).

84971521 is an equidigital number, since it uses as much as digits as its factorization.

84971521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 84971521 is about 9217.9998372749. Note that the first 3 decimals coincide. The cubic root of 84971521 is about 439.6338569023.

The spelling of 84971521 in words is "eighty-four million, nine hundred seventy-one thousand, five hundred twenty-one".