65516431 has 2 divisors, whose sum is σ = 65516432. Its totient is φ = 65516430.

The previous prime is 65516417. The next prime is 65516459. The reversal of 65516431 is 13461556.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65516431 is a prime.

It is a super-2 number, since 2×65516431² = 8584805461955522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 65516393 and 65516402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65516461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32758215 + 32758216.

It is an arithmetic number, because the mean of its divisors is an integer number (32758216).

Almost surely, 2^65516431 is an apocalyptic number.

65516431 is a deficient number, since it is larger than the sum of its proper divisors (1).

65516431 is an equidigital number, since it uses as much as digits as its factorization.

65516431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The square root of 65516431 is about 8094.2220750360. Note that the first 3 decimals coincide. The cubic root of 65516431 is about 403.1346027478.

Adding to 65516431 its reverse (13461556), we get a palindrome (78977987).

The spelling of 65516431 in words is "sixty-five million, five hundred sixteen thousand, four hundred thirty-one".