65381491 has 4 divisors (see below), whose sum is σ = 74721712. Its totient is φ = 56041272.

The previous prime is 65381471. The next prime is 65381497. The reversal of 65381491 is 19418356.

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

It is not a de Polignac number, because 65381491 - 2⁹ = 65380979 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 65381491.

It is not an unprimeable number, because it can be changed into a prime (65381497) 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, 4670100 + ... + 4670113.

It is an arithmetic number, because the mean of its divisors is an integer number (18680428).

Almost surely, 2^65381491 is an apocalyptic number.

65381491 is a deficient number, since it is larger than the sum of its proper divisors (9340221).

65381491 is an equidigital number, since it uses as much as digits as its factorization.

65381491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9340220.

The product of its digits is 25920, while the sum is 37.

The square root of 65381491 is about 8085.8822029510. The cubic root of 65381491 is about 402.8576423344.

The spelling of 65381491 in words is "sixty-five million, three hundred eighty-one thousand, four hundred ninety-one".