65497391 has 8 divisors (see below), whose sum is σ = 67127424. Its totient is φ = 63886680.

The previous prime is 65497387. The next prime is 65497403. The reversal of 65497391 is 19379456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65497391 - 2² = 65497387 is a prime.

It is a super-3 number, since 3×65497391³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65497301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2156 + ... + 11646.

It is an arithmetic number, because the mean of its divisors is an integer number (8390928).

Almost surely, 2^65497391 is an apocalyptic number.

65497391 is a deficient number, since it is larger than the sum of its proper divisors (1630033).

65497391 is a wasteful number, since it uses less digits than its factorization.

65497391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9661.

The product of its digits is 204120, while the sum is 44.

The square root of 65497391 is about 8093.0458419559. The cubic root of 65497391 is about 403.0955467615.

The spelling of 65497391 in words is "sixty-five million, four hundred ninety-seven thousand, three hundred ninety-one".