84691247 has 2 divisors, whose sum is σ = 84691248. Its totient is φ = 84691246.

The previous prime is 84691237. The next prime is 84691253. The reversal of 84691247 is 74219648.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84691247 - 2⁴ = 84691231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84691207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42345623 + 42345624.

It is an arithmetic number, because the mean of its divisors is an integer number (42345624).

Almost surely, 2^84691247 is an apocalyptic number.

84691247 is a deficient number, since it is larger than the sum of its proper divisors (1).

84691247 is an equidigital number, since it uses as much as digits as its factorization.

84691247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 84691247 is about 9202.7847415877. The cubic root of 84691247 is about 439.1499549123.

The spelling of 84691247 in words is "eighty-four million, six hundred ninety-one thousand, two hundred forty-seven".