65426981 has 2 divisors, whose sum is σ = 65426982. Its totient is φ = 65426980.

The previous prime is 65426947. The next prime is 65427001. The reversal of 65426981 is 18962456.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50481025 + 14945956 = 7105^2 + 3866^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65426981 is a prime.

It is a super-2 number, since 2×65426981² = 8561379685548722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65426381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32713490 + 32713491.

It is an arithmetic number, because the mean of its divisors is an integer number (32713491).

Almost surely, 2^65426981 is an apocalyptic number.

It is an amenable number.

65426981 is a deficient number, since it is larger than the sum of its proper divisors (1).

65426981 is an equidigital number, since it uses as much as digits as its factorization.

65426981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 65426981 is about 8088.6946412879. The cubic root of 65426981 is about 402.9510517755.

The spelling of 65426981 in words is "sixty-five million, four hundred twenty-six thousand, nine hundred eighty-one".