65197391 has 6 divisors (see below), whose sum is σ = 75841920. Its totient is φ = 55883436.

The previous prime is 65197381. The next prime is 65197393. The reversal of 65197391 is 19379156.

It is a de Polignac number, because none of the positive numbers 2^k-65197391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65197393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665231 + ... + 665328.

It is an arithmetic number, because the mean of its divisors is an integer number (12640320).

Almost surely, 2^65197391 is an apocalyptic number.

65197391 is a deficient number, since it is larger than the sum of its proper divisors (10644529).

65197391 is a wasteful number, since it uses less digits than its factorization.

65197391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330573 (or 1330566 counting only the distinct ones).

The product of its digits is 51030, while the sum is 41.

The square root of 65197391 is about 8074.4901387023. The cubic root of 65197391 is about 402.4791671637.

The spelling of 65197391 in words is "sixty-five million, one hundred ninety-seven thousand, three hundred ninety-one".