65091797 has 2 divisors, whose sum is σ = 65091798. Its totient is φ = 65091796.

The previous prime is 65091779. The next prime is 65091799. The reversal of 65091797 is 79719056.

Together with previous prime (65091779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61246276 + 3845521 = 7826^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 65091797 - 2¹⁶ = 65026261 is a prime.

Together with 65091799, 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 (65091799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32545898 + 32545899.

It is an arithmetic number, because the mean of its divisors is an integer number (32545899).

Almost surely, 2^65091797 is an apocalyptic number.

65091797 is the 4313-rd centered heptagonal number.

It is an amenable number.

65091797 is a deficient number, since it is larger than the sum of its proper divisors (1).

65091797 is an equidigital number, since it uses as much as digits as its factorization.

65091797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 65091797 is about 8067.9487479780. The cubic root of 65091797 is about 402.2617640373.

The spelling of 65091797 in words is "sixty-five million, ninety-one thousand, seven hundred ninety-seven".