65132581 has 4 divisors (see below), whose sum is σ = 67233664. Its totient is φ = 63031500.

The previous prime is 65132563. The next prime is 65132609. The reversal of 65132581 is 18523156.

65132581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65132581 - 2⁷ = 65132453 is a prime.

It is a super-2 number, since 2×65132581² = 8484506215443122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2101051 = 65132581 / (6 + 5 + 1 + 3 + 2 + 5 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65132531) 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 3 ways as a sum of consecutive naturals, for example, 1050495 + ... + 1050556.

It is an arithmetic number, because the mean of its divisors is an integer number (16808416).

Almost surely, 2^65132581 is an apocalyptic number.

It is an amenable number.

65132581 is a deficient number, since it is larger than the sum of its proper divisors (2101083).

65132581 is a wasteful number, since it uses less digits than its factorization.

65132581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101082.

The product of its digits is 7200, while the sum is 31.

The square root of 65132581 is about 8070.4758843577. The cubic root of 65132581 is about 402.3457603794.

The spelling of 65132581 in words is "sixty-five million, one hundred thirty-two thousand, five hundred eighty-one".