65239819 has 2 divisors, whose sum is σ = 65239820. Its totient is φ = 65239818.

The previous prime is 65239793. The next prime is 65239847. The reversal of 65239819 is 91893256.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65239819 - 2¹⁹ = 64715531 is a prime.

It is a super-2 number, since 2×65239819² = 8512467966305522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65239219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32619909 + 32619910.

It is an arithmetic number, because the mean of its divisors is an integer number (32619910).

Almost surely, 2^65239819 is an apocalyptic number.

65239819 is a deficient number, since it is larger than the sum of its proper divisors (1).

65239819 is an equidigital number, since it uses as much as digits as its factorization.

65239819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 65239819 is about 8077.1169980383. The cubic root of 65239819 is about 402.5664543131.

The spelling of 65239819 in words is "sixty-five million, two hundred thirty-nine thousand, eight hundred nineteen".