64221151 has 4 divisors (see below), whose sum is σ = 64400400. Its totient is φ = 64041904.

The previous prime is 64221139. The next prime is 64221163. The reversal of 64221151 is 15112246.

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

It is an interprime number because it is at equal distance from previous prime (64221139) and next prime (64221163).

It is a cyclic number.

It is not a de Polignac number, because 64221151 - 2¹³ = 64212959 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 (64221191) 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, 89086 + ... + 89803.

It is an arithmetic number, because the mean of its divisors is an integer number (16100100).

Almost surely, 2^64221151 is an apocalyptic number.

64221151 is a deficient number, since it is larger than the sum of its proper divisors (179249).

64221151 is a wasteful number, since it uses less digits than its factorization.

64221151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179248.

The product of its digits is 480, while the sum is 22.

The square root of 64221151 is about 8013.8100177132. The cubic root of 64221151 is about 400.4602015832.

Adding to 64221151 its reverse (15112246), we get a palindrome (79333397).

The spelling of 64221151 in words is "sixty-four million, two hundred twenty-one thousand, one hundred fifty-one".