220628531 has 2 divisors, whose sum is σ = 220628532. Its totient is φ = 220628530.

The previous prime is 220628509. The next prime is 220628623. The reversal of 220628531 is 135826022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220628531 - 2¹⁸ = 220366387 is a prime.

It is a super-2 number, since 2×220628531² = 97353897382435922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 220628494 and 220628503.

It is not a weakly prime, because it can be changed into another prime (220628501) 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, 110314265 + 110314266.

It is an arithmetic number, because the mean of its divisors is an integer number (110314266).

Almost surely, 2^220628531 is an apocalyptic number.

220628531 is a deficient number, since it is larger than the sum of its proper divisors (1).

220628531 is an equidigital number, since it uses as much as digits as its factorization.

220628531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 220628531 is about 14853.5696383058. The cubic root of 220628531 is about 604.2554244381.

The spelling of 220628531 in words is "two hundred twenty million, six hundred twenty-eight thousand, five hundred thirty-one".