65481729 has 4 divisors (see below), whose sum is σ = 87308976. Its totient is φ = 43654484.

The previous prime is 65481721. The next prime is 65481751. The reversal of 65481729 is 92718456.

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 65481729 - 2³ = 65481721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65481721) 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, 10913619 + ... + 10913624.

It is an arithmetic number, because the mean of its divisors is an integer number (21827244).

Almost surely, 2^65481729 is an apocalyptic number.

It is an amenable number.

65481729 is a deficient number, since it is larger than the sum of its proper divisors (21827247).

65481729 is a wasteful number, since it uses less digits than its factorization.

65481729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21827246.

The product of its digits is 120960, while the sum is 42.

The square root of 65481729 is about 8092.0781632409. The cubic root of 65481729 is about 403.0634142564.

The spelling of 65481729 in words is "sixty-five million, four hundred eighty-one thousand, seven hundred twenty-nine".