65242981 has 4 divisors (see below), whose sum is σ = 65876512. Its totient is φ = 64609452.

The previous prime is 65242943. The next prime is 65242987. The reversal of 65242981 is 18924256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65242981 - 2⁹ = 65242469 is a prime.

It is a super-2 number, since 2×65242981² = 8513293139532722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65242981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65242987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316611 + ... + 316816.

It is an arithmetic number, because the mean of its divisors is an integer number (16469128).

Almost surely, 2^65242981 is an apocalyptic number.

It is an amenable number.

65242981 is a deficient number, since it is larger than the sum of its proper divisors (633531).

65242981 is a wasteful number, since it uses less digits than its factorization.

65242981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633530.

The product of its digits is 34560, while the sum is 37.

The square root of 65242981 is about 8077.3127338243. The cubic root of 65242981 is about 402.5729579821.

The spelling of 65242981 in words is "sixty-five million, two hundred forty-two thousand, nine hundred eighty-one".