65732981 has 2 divisors, whose sum is σ = 65732982. Its totient is φ = 65732980.

The previous prime is 65732971. The next prime is 65732987. The reversal of 65732981 is 18923756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63856081 + 1876900 = 7991^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 65732981 - 2¹⁰ = 65731957 is a prime.

It is a super-2 number, since 2×65732981² = 8641649582292722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65732987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32866490 + 32866491.

It is an arithmetic number, because the mean of its divisors is an integer number (32866491).

Almost surely, 2^65732981 is an apocalyptic number.

It is an amenable number.

65732981 is a deficient number, since it is larger than the sum of its proper divisors (1).

65732981 is an equidigital number, since it uses as much as digits as its factorization.

65732981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 65732981 is about 8107.5878656972. The cubic root of 65732981 is about 403.5782715643.

The spelling of 65732981 in words is "sixty-five million, seven hundred thirty-two thousand, nine hundred eighty-one".