84572561 has 2 divisors, whose sum is σ = 84572562. Its totient is φ = 84572560.

The previous prime is 84572539. The next prime is 84572567. The reversal of 84572561 is 16527548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57988225 + 26584336 = 7615^2 + 5156^2 .

It is a cyclic number.

It is not a de Polignac number, because 84572561 - 2¹⁰ = 84571537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84572567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42286280 + 42286281.

It is an arithmetic number, because the mean of its divisors is an integer number (42286281).

Almost surely, 2^84572561 is an apocalyptic number.

It is an amenable number.

84572561 is a deficient number, since it is larger than the sum of its proper divisors (1).

84572561 is an equidigital number, since it uses as much as digits as its factorization.

84572561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 84572561 is about 9196.3341065883. The cubic root of 84572561 is about 438.9447179693.

The spelling of 84572561 in words is "eighty-four million, five hundred seventy-two thousand, five hundred sixty-one".