65481631 has 2 divisors, whose sum is σ = 65481632. Its totient is φ = 65481630.

The previous prime is 65481629. The next prime is 65481643. The reversal of 65481631 is 13618456.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65481631 - 2¹ = 65481629 is a prime.

It is a super-2 number, since 2×65481631² = 8575687996840322, which contains 22 as substring.

Together with 65481629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65481931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32740815 + 32740816.

It is an arithmetic number, because the mean of its divisors is an integer number (32740816).

Almost surely, 2^65481631 is an apocalyptic number.

65481631 is a deficient number, since it is larger than the sum of its proper divisors (1).

65481631 is an equidigital number, since it uses as much as digits as its factorization.

65481631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 65481631 is about 8092.0721079338. The cubic root of 65481631 is about 403.0632131813.

The spelling of 65481631 in words is "sixty-five million, four hundred eighty-one thousand, six hundred thirty-one".