65131649 has 8 divisors (see below), whose sum is σ = 71718048. Its totient is φ = 58656160.

The previous prime is 65131643. The next prime is 65131663. The reversal of 65131649 is 94613156.

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

It is a cyclic number.

It is not a de Polignac number, because 65131649 - 2⁸ = 65131393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65131643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26492 + ... + 28845.

It is an arithmetic number, because the mean of its divisors is an integer number (8964756).

Almost surely, 2^65131649 is an apocalyptic number.

It is an amenable number.

65131649 is a deficient number, since it is larger than the sum of its proper divisors (6586399).

65131649 is a wasteful number, since it uses less digits than its factorization.

65131649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55455.

The product of its digits is 19440, while the sum is 35.

The square root of 65131649 is about 8070.4181428226. The cubic root of 65131649 is about 402.3438412783.

The spelling of 65131649 in words is "sixty-five million, one hundred thirty-one thousand, six hundred forty-nine".