65991293 has 2 divisors, whose sum is σ = 65991294. Its totient is φ = 65991292.

The previous prime is 65991271. The next prime is 65991311. The reversal of 65991293 is 39219956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43731769 + 22259524 = 6613^2 + 4718^2 .

It is a cyclic number.

It is not a de Polignac number, because 65991293 - 2¹² = 65987197 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 (65991193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32995646 + 32995647.

It is an arithmetic number, because the mean of its divisors is an integer number (32995647).

Almost surely, 2^65991293 is an apocalyptic number.

It is an amenable number.

65991293 is a deficient number, since it is larger than the sum of its proper divisors (1).

65991293 is an equidigital number, since it uses as much as digits as its factorization.

65991293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 44.

The square root of 65991293 is about 8123.5025081550. The cubic root of 65991293 is about 404.1062300297.

The spelling of 65991293 in words is "sixty-five million, nine hundred ninety-one thousand, two hundred ninety-three".