65140247 has 2 divisors, whose sum is σ = 65140248. Its totient is φ = 65140246.

The previous prime is 65140241. The next prime is 65140249. The reversal of 65140247 is 74204156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65140247 - 2⁶ = 65140183 is a prime.

Together with 65140249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65140241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32570123 + 32570124.

It is an arithmetic number, because the mean of its divisors is an integer number (32570124).

Almost surely, 2^65140247 is an apocalyptic number.

65140247 is a deficient number, since it is larger than the sum of its proper divisors (1).

65140247 is an equidigital number, since it uses as much as digits as its factorization.

65140247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 65140247 is about 8070.9508113976. The cubic root of 65140247 is about 402.3615449098.

The spelling of 65140247 in words is "sixty-five million, one hundred forty thousand, two hundred forty-seven".