65490981 has 8 divisors (see below), whose sum is σ = 89451264. Its totient is φ = 42595680.

The previous prime is 65490973. The next prime is 65490983. The reversal of 65490981 is 18909456.

65490981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65490981 - 2³ = 65490973 is a prime.

It is a super-2 number, since 2×65490981² = 8578137184684722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65490983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266101 + ... + 266346.

It is an arithmetic number, because the mean of its divisors is an integer number (11181408).

Almost surely, 2^65490981 is an apocalyptic number.

It is an amenable number.

65490981 is a deficient number, since it is larger than the sum of its proper divisors (23960283).

65490981 is a wasteful number, since it uses less digits than its factorization.

65490981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532491.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 65490981 is about 8092.6498132565. The cubic root of 65490981 is about 403.0823964832.

The spelling of 65490981 in words is "sixty-five million, four hundred ninety thousand, nine hundred eighty-one".