65891231 has 12 divisors (see below), whose sum is σ = 76955472. Its totient is φ = 56252448.

The previous prime is 65891207. The next prime is 65891233. The reversal of 65891231 is 13219856.

It is not a de Polignac number, because 65891231 - 2¹⁰ = 65890207 is a prime.

It is a super-2 number, since 2×65891231² = 8683308645390722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65891191 and 65891200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65891233) 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 in 11 ways as a sum of consecutive naturals, for example, 10331 + ... + 15443.

It is an arithmetic number, because the mean of its divisors is an integer number (6412956).

Almost surely, 2^65891231 is an apocalyptic number.

65891231 is a deficient number, since it is larger than the sum of its proper divisors (11064241).

65891231 is a wasteful number, since it uses less digits than its factorization.

65891231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5390 (or 5383 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 65891231 is about 8117.3413751055. The cubic root of 65891231 is about 403.9018791707.

The spelling of 65891231 in words is "sixty-five million, eight hundred ninety-one thousand, two hundred thirty-one".