65471621 has 2 divisors, whose sum is σ = 65471622. Its totient is φ = 65471620.

The previous prime is 65471603. The next prime is 65471633. The reversal of 65471621 is 12617456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57547396 + 7924225 = 7586^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 65471621 - 2⁶ = 65471557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65471221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32735810 + 32735811.

It is an arithmetic number, because the mean of its divisors is an integer number (32735811).

Almost surely, 2^65471621 is an apocalyptic number.

It is an amenable number.

65471621 is a deficient number, since it is larger than the sum of its proper divisors (1).

65471621 is an equidigital number, since it uses as much as digits as its factorization.

65471621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 65471621 is about 8091.4535776954. The cubic root of 65471621 is about 403.0426737399.

The spelling of 65471621 in words is "sixty-five million, four hundred seventy-one thousand, six hundred twenty-one".