1225655321 has 32 divisors (see below), whose sum is σ = 1402997760. Its totient is φ = 1061121600.

The previous prime is 1225655279. The next prime is 1225655357. The reversal of 1225655321 is 1235565221.

It is not a de Polignac number, because 1225655321 - 2¹⁸ = 1225393177 is a prime.

It is a super-2 number, since 2×1225655321² = 3004461931791226082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225655621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3087095 + ... + 3087491.

It is an arithmetic number, because the mean of its divisors is an integer number (43843680).

Almost surely, 2^1225655321 is an apocalyptic number.

1225655321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1225655321 is a deficient number, since it is larger than the sum of its proper divisors (177342439).

1225655321 is a wasteful number, since it uses less digits than its factorization.

1225655321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605.

The product of its digits is 18000, while the sum is 32.

The square root of 1225655321 is about 35009.3604768782. The cubic root of 1225655321 is about 1070.1782452640.

The spelling of 1225655321 in words is "one billion, two hundred twenty-five million, six hundred fifty-five thousand, three hundred twenty-one".