85140247 has 2 divisors, whose sum is σ = 85140248. Its totient is φ = 85140246.

The previous prime is 85140203. The next prime is 85140271. The reversal of 85140247 is 74204158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85140247 - 2¹¹ = 85138199 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 (85140347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42570123 + 42570124.

It is an arithmetic number, because the mean of its divisors is an integer number (42570124).

Almost surely, 2^85140247 is an apocalyptic number.

85140247 is a deficient number, since it is larger than the sum of its proper divisors (1).

85140247 is an equidigital number, since it uses as much as digits as its factorization.

85140247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 85140247 is about 9227.1472839659. The cubic root of 85140247 is about 439.9246547984.

The spelling of 85140247 in words is "eighty-five million, one hundred forty thousand, two hundred forty-seven".