65317531 has 2 divisors, whose sum is σ = 65317532. Its totient is φ = 65317530.

The previous prime is 65317513. The next prime is 65317547. The reversal of 65317531 is 13571356.

Together with previous prime (65317513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65317531 - 2¹⁵ = 65284763 is a prime.

It is a super-2 number, since 2×65317531² = 8532759711871922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65317493 and 65317502.

It is not a weakly prime, because it can be changed into another prime (65317561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32658765 + 32658766.

It is an arithmetic number, because the mean of its divisors is an integer number (32658766).

Almost surely, 2^65317531 is an apocalyptic number.

65317531 is a deficient number, since it is larger than the sum of its proper divisors (1).

65317531 is an equidigital number, since it uses as much as digits as its factorization.

65317531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 31.

The square root of 65317531 is about 8081.9261936744. The cubic root of 65317531 is about 402.7262331686.

Adding to 65317531 its reverse (13571356), we get a palindrome (78888887).

The spelling of 65317531 in words is "sixty-five million, three hundred seventeen thousand, five hundred thirty-one".