65108981 has 4 divisors (see below), whose sum is σ = 74410272. Its totient is φ = 55807692.

The previous prime is 65108971. The next prime is 65108983. The reversal of 65108981 is 18980156.

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 65108981 - 2¹⁴ = 65092597 is a prime.

It is a super-2 number, since 2×65108981² = 8478358813716722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65108983) 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, 4650635 + ... + 4650648.

It is an arithmetic number, because the mean of its divisors is an integer number (18602568).

Almost surely, 2^65108981 is an apocalyptic number.

It is an amenable number.

65108981 is a deficient number, since it is larger than the sum of its proper divisors (9301291).

65108981 is an equidigital number, since it uses as much as digits as its factorization.

65108981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9301290.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 65108981 is about 8069.0136324089. The cubic root of 65108981 is about 402.2971594751.

The spelling of 65108981 in words is "sixty-five million, one hundred eight thousand, nine hundred eighty-one".