220121549 has 2 divisors, whose sum is σ = 220121550. Its totient is φ = 220121548.

The previous prime is 220121519. The next prime is 220121563. The reversal of 220121549 is 945121022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124434025 + 95687524 = 11155^2 + 9782^2 .

It is a cyclic number.

It is not a de Polignac number, because 220121549 - 2¹⁶ = 220056013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220121509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110060774 + 110060775.

It is an arithmetic number, because the mean of its divisors is an integer number (110060775).

Almost surely, 2^220121549 is an apocalyptic number.

It is an amenable number.

220121549 is a deficient number, since it is larger than the sum of its proper divisors (1).

220121549 is an equidigital number, since it uses as much as digits as its factorization.

220121549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 220121549 is about 14836.4938243508. The cubic root of 220121549 is about 603.7922302275.

The spelling of 220121549 in words is "two hundred twenty million, one hundred twenty-one thousand, five hundred forty-nine".