1221064575 has 24 divisors (see below), whose sum is σ = 2088445200. Its totient is φ = 628776960.

The previous prime is 1221064571. The next prime is 1221064613. The reversal of 1221064575 is 5754601221.

It is not a de Polignac number, because 1221064575 - 2² = 1221064571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221064571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278530 + ... + 282879.

It is an arithmetic number, because the mean of its divisors is an integer number (87018550).

Almost surely, 2^1221064575 is an apocalyptic number.

1221064575 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221064575 is a deficient number, since it is larger than the sum of its proper divisors (867380625).

1221064575 is a wasteful number, since it uses less digits than its factorization.

1221064575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561451 (or 561446 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 1221064575 is about 34943.7344169166. The cubic root of 1221064575 is about 1068.8404403476.

Adding to 1221064575 its reverse (5754601221), we get a palindrome (6975665796).

The spelling of 1221064575 in words is "one billion, two hundred twenty-one million, sixty-four thousand, five hundred seventy-five".