65491291 has 2 divisors, whose sum is σ = 65491292. Its totient is φ = 65491290.

The previous prime is 65491289. The next prime is 65491303. The reversal of 65491291 is 19219456.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65491291 - 2¹ = 65491289 is a prime.

Together with 65491289, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 65491291.

It is not a weakly prime, because it can be changed into another prime (65491201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32745645 + 32745646.

It is an arithmetic number, because the mean of its divisors is an integer number (32745646).

Almost surely, 2^65491291 is an apocalyptic number.

65491291 is a deficient number, since it is larger than the sum of its proper divisors (1).

65491291 is an equidigital number, since it uses as much as digits as its factorization.

65491291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 65491291 is about 8092.6689664165. The cubic root of 65491291 is about 403.0830324758.

The spelling of 65491291 in words is "sixty-five million, four hundred ninety-one thousand, two hundred ninety-one".