220985537 has 2 divisors, whose sum is σ = 220985538. Its totient is φ = 220985536.

The previous prime is 220985519. The next prime is 220985551. The reversal of 220985537 is 735589022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215972416 + 5013121 = 14696^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 220985537 - 2⁶ = 220985473 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 220985494 and 220985503.

It is not a weakly prime, because it can be changed into another prime (220985437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110492768 + 110492769.

It is an arithmetic number, because the mean of its divisors is an integer number (110492769).

Almost surely, 2^220985537 is an apocalyptic number.

It is an amenable number.

220985537 is a deficient number, since it is larger than the sum of its proper divisors (1).

220985537 is an equidigital number, since it uses as much as digits as its factorization.

220985537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 220985537 is about 14865.5822960286. The cubic root of 220985537 is about 604.5811704022.

The spelling of 220985537 in words is "two hundred twenty million, nine hundred eighty-five thousand, five hundred thirty-seven".