65371921 has 4 divisors (see below), whose sum is σ = 65457700. Its totient is φ = 65286144.

The previous prime is 65371909. The next prime is 65371939. The reversal of 65371921 is 12917356.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30691600 + 34680321 = 5540^2 + 5889^2 .

It is a cyclic number.

It is not a de Polignac number, because 65371921 - 2⁷ = 65371793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65371981) 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, 41736 + ... + 43273.

It is an arithmetic number, because the mean of its divisors is an integer number (16364425).

Almost surely, 2^65371921 is an apocalyptic number.

It is an amenable number.

65371921 is a deficient number, since it is larger than the sum of its proper divisors (85779).

65371921 is an equidigital number, since it uses as much as digits as its factorization.

65371921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85778.

The product of its digits is 11340, while the sum is 34.

The square root of 65371921 is about 8085.2904091319. The cubic root of 65371921 is about 402.8379857226.

The spelling of 65371921 in words is "sixty-five million, three hundred seventy-one thousand, nine hundred twenty-one".