65391397 has 4 divisors (see below), whose sum is σ = 66367456. Its totient is φ = 64415340.

The previous prime is 65391379. The next prime is 65391413. The reversal of 65391397 is 79319356.

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 65391397 - 2²³ = 57002789 is a prime.

It is a super-2 number, since 2×65391397² = 8552069603223218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65391097) 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, 487929 + ... + 488062.

It is an arithmetic number, because the mean of its divisors is an integer number (16591864).

Almost surely, 2^65391397 is an apocalyptic number.

65391397 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

65391397 is a deficient number, since it is larger than the sum of its proper divisors (976059).

65391397 is an equidigital number, since it uses as much as digits as its factorization.

65391397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976058.

The product of its digits is 153090, while the sum is 43.

The square root of 65391397 is about 8086.4947288674. The cubic root of 65391397 is about 402.8779870640.

The spelling of 65391397 in words is "sixty-five million, three hundred ninety-one thousand, three hundred ninety-seven".