220545931 has 2 divisors, whose sum is σ = 220545932. Its totient is φ = 220545930.

The previous prime is 220545889. The next prime is 220545971. The reversal of 220545931 is 139545022.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220545931 - 2¹³ = 220537739 is a prime.

It is a super-2 number, since 2×220545931² = 97281015361313522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 220545893 and 220545902.

It is not a weakly prime, because it can be changed into another prime (220545971) 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 as a sum of consecutive naturals, namely, 110272965 + 110272966.

It is an arithmetic number, because the mean of its divisors is an integer number (110272966).

Almost surely, 2^220545931 is an apocalyptic number.

220545931 is a deficient number, since it is larger than the sum of its proper divisors (1).

220545931 is an equidigital number, since it uses as much as digits as its factorization.

220545931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 220545931 is about 14850.7889016038. The cubic root of 220545931 is about 604.1800069814.

The spelling of 220545931 in words is "two hundred twenty million, five hundred forty-five thousand, nine hundred thirty-one".