1220522605 has 8 divisors (see below), whose sum is σ = 1477589112. Its totient is φ = 967776768.

The previous prime is 1220522573. The next prime is 1220522617. The reversal of 1220522605 is 5062250221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 69006249 + 1151516356 = 8307^2 + 33934^2 .

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 1220522605 - 2⁵ = 1220522573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220522605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1079544 + ... + 1080673.

It is an arithmetic number, because the mean of its divisors is an integer number (184698639).

Almost surely, 2^1220522605 is an apocalyptic number.

It is an amenable number.

1220522605 is a deficient number, since it is larger than the sum of its proper divisors (257066507).

1220522605 is a wasteful number, since it uses less digits than its factorization.

1220522605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160335.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1220522605 is about 34935.9786609736. The cubic root of 1220522605 is about 1068.6822818601.

Adding to 1220522605 its reverse (5062250221), we get a palindrome (6282772826).

The spelling of 1220522605 in words is "one billion, two hundred twenty million, five hundred twenty-two thousand, six hundred five".