65312489 has 4 divisors (see below), whose sum is σ = 71250000. Its totient is φ = 59374980.

The previous prime is 65312449. The next prime is 65312491. The reversal of 65312489 is 98421356.

It is a happy number.

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 65312489 - 2²⁴ = 48535273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65312449) 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, 2968739 + ... + 2968760.

It is an arithmetic number, because the mean of its divisors is an integer number (17812500).

Almost surely, 2^65312489 is an apocalyptic number.

It is an amenable number.

65312489 is a deficient number, since it is larger than the sum of its proper divisors (5937511).

65312489 is a wasteful number, since it uses less digits than its factorization.

65312489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5937510.

The product of its digits is 51840, while the sum is 38.

The square root of 65312489 is about 8081.6142570652. The cubic root of 65312489 is about 402.7158704687.

The spelling of 65312489 in words is "sixty-five million, three hundred twelve thousand, four hundred eighty-nine".