1220761605 has 32 divisors (see below), whose sum is σ = 2245976064. Its totient is φ = 554630976.

The previous prime is 1220761603. The next prime is 1220761613. The reversal of 1220761605 is 5061670221.

It is not a de Polignac number, because 1220761605 - 2¹ = 1220761603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220761603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18549 + ... + 52778.

It is an arithmetic number, because the mean of its divisors is an integer number (70186752).

Almost surely, 2^1220761605 is an apocalyptic number.

1220761605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220761605 is a deficient number, since it is larger than the sum of its proper divisors (1025214459).

1220761605 is a wasteful number, since it uses less digits than its factorization.

1220761605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71505.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1220761605 is about 34939.3990360453. The cubic root of 1220761605 is about 1068.7520329635.

The spelling of 1220761605 in words is "one billion, two hundred twenty million, seven hundred sixty-one thousand, six hundred five".