220531531 has 16 divisors (see below), whose sum is σ = 258920928. Its totient is φ = 185587200.

The previous prime is 220531529. The next prime is 220531547. The reversal of 220531531 is 135135022.

It is a cyclic number.

It is not a de Polignac number, because 220531531 - 2¹ = 220531529 is a prime.

It is a super-2 number, since 2×220531531² = 97268312330407922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220531561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1741 + ... + 21073.

It is an arithmetic number, because the mean of its divisors is an integer number (16182558).

Almost surely, 2^220531531 is an apocalyptic number.

220531531 is a deficient number, since it is larger than the sum of its proper divisors (38389397).

220531531 is a wasteful number, since it uses less digits than its factorization.

220531531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19422.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 220531531 is about 14850.3040709610. The cubic root of 220531531 is about 604.1668572165.

Adding to 220531531 its reverse (135135022), we get a palindrome (355666553).

The spelling of 220531531 in words is "two hundred twenty million, five hundred thirty-one thousand, five hundred thirty-one".