64222531 has 4 divisors (see below), whose sum is σ = 64242864. Its totient is φ = 64202200.

The previous prime is 64222519. The next prime is 64222547. The reversal of 64222531 is 13522246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13522246 = 2 ⋅6761123.

It is a cyclic number.

It is not a de Polignac number, because 64222531 - 2⁹ = 64222019 is a prime.

It is a super-2 number, since 2×64222531² = 8249066976091922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64222496 and 64222505.

It is not an unprimeable number, because it can be changed into a prime (64222931) 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, 4300 + ... + 12121.

It is an arithmetic number, because the mean of its divisors is an integer number (16060716).

Almost surely, 2^64222531 is an apocalyptic number.

64222531 is a deficient number, since it is larger than the sum of its proper divisors (20333).

64222531 is a wasteful number, since it uses less digits than its factorization.

64222531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20332.

The product of its digits is 2880, while the sum is 25.

The square root of 64222531 is about 8013.8961186180. The cubic root of 64222531 is about 400.4630699587.

Adding to 64222531 its reverse (13522246), we get a palindrome (77744777).

The spelling of 64222531 in words is "sixty-four million, two hundred twenty-two thousand, five hundred thirty-one".