65220591 has 4 divisors (see below), whose sum is σ = 86960792. Its totient is φ = 43480392.

The previous prime is 65220563. The next prime is 65220599. The reversal of 65220591 is 19502256.

It is a happy number.

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

It is not a de Polignac number, because 65220591 - 2¹⁴ = 65204207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65220599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10870096 + ... + 10870101.

It is an arithmetic number, because the mean of its divisors is an integer number (21740198).

Almost surely, 2^65220591 is an apocalyptic number.

65220591 is a deficient number, since it is larger than the sum of its proper divisors (21740201).

65220591 is a wasteful number, since it uses less digits than its factorization.

65220591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21740200.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 65220591 is about 8075.9266341393. The cubic root of 65220591 is about 402.5269012279.

The spelling of 65220591 in words is "sixty-five million, two hundred twenty thousand, five hundred ninety-one".