65197439 has 4 divisors (see below), whose sum is σ = 65214480. Its totient is φ = 65180400.

The previous prime is 65197427. The next prime is 65197459. The reversal of 65197439 is 93479156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65197439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65197439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65197409) 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, 182 + ... + 11420.

It is an arithmetic number, because the mean of its divisors is an integer number (16303620).

Almost surely, 2^65197439 is an apocalyptic number.

65197439 is a deficient number, since it is larger than the sum of its proper divisors (17041).

65197439 is a wasteful number, since it uses less digits than its factorization.

65197439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17040.

The product of its digits is 204120, while the sum is 44.

The square root of 65197439 is about 8074.4931110256. The cubic root of 65197439 is about 402.4792659355.

The spelling of 65197439 in words is "sixty-five million, one hundred ninety-seven thousand, four hundred thirty-nine".