84653509 has 2 divisors, whose sum is σ = 84653510. Its totient is φ = 84653508.

The previous prime is 84653441. The next prime is 84653539. The reversal of 84653509 is 90535648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50722884 + 33930625 = 7122^2 + 5825^2 .

It is a cyclic number.

It is not a de Polignac number, because 84653509 - 2⁷ = 84653381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84653539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42326754 + 42326755.

It is an arithmetic number, because the mean of its divisors is an integer number (42326755).

Almost surely, 2^84653509 is an apocalyptic number.

It is an amenable number.

84653509 is a deficient number, since it is larger than the sum of its proper divisors (1).

84653509 is an equidigital number, since it uses as much as digits as its factorization.

84653509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 84653509 is about 9200.7341554900. The cubic root of 84653509 is about 439.0847175402.

The spelling of 84653509 in words is "eighty-four million, six hundred fifty-three thousand, five hundred nine".