1210220545 has 8 divisors (see below), whose sum is σ = 1455445224. Its totient is φ = 966056064.

The previous prime is 1210220533. The next prime is 1210220549. The reversal of 1210220545 is 5450220121.

It can be written as a sum of positive squares in 4 ways, for example, as 59721984 + 1150498561 = 7728^2 + 33919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1210220545 - 2¹¹ = 1210218497 is a prime.

It is a super-3 number, since 3×1210220545³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210220549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262534 + ... + 267103.

It is an arithmetic number, because the mean of its divisors is an integer number (181930653).

Almost surely, 2^1210220545 is an apocalyptic number.

It is an amenable number.

1210220545 is a deficient number, since it is larger than the sum of its proper divisors (245224679).

1210220545 is an equidigital number, since it uses as much as digits as its factorization.

1210220545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530099.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1210220545 is about 34788.2242288968. The cubic root of 1210220545 is about 1065.6669747744. Note that the first 3 decimals are identical.

Adding to 1210220545 its reverse (5450220121), we get a palindrome (6660440666).

The spelling of 1210220545 in words is "one billion, two hundred ten million, two hundred twenty thousand, five hundred forty-five".