65047991 has 2 divisors, whose sum is σ = 65047992. Its totient is φ = 65047990.

The previous prime is 65047987. The next prime is 65048023. The reversal of 65047991 is 19974056.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65047991 - 2² = 65047987 is a prime.

It is a super-2 number, since 2×65047991² = 8462482266272162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65047901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32523995 + 32523996.

It is an arithmetic number, because the mean of its divisors is an integer number (32523996).

Almost surely, 2^65047991 is an apocalyptic number.

65047991 is a deficient number, since it is larger than the sum of its proper divisors (1).

65047991 is an equidigital number, since it uses as much as digits as its factorization.

65047991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 65047991 is about 8065.2334746119. The cubic root of 65047991 is about 402.1715046695.

The spelling of 65047991 in words is "sixty-five million, forty-seven thousand, nine hundred ninety-one".