1225281660 has 36 divisors (see below), whose sum is σ = 3431548008. Its totient is φ = 326669472.

The previous prime is 1225281643. The next prime is 1225281731. The reversal of 1225281660 is 661825221.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 268881 + ... + 273399.

It is an arithmetic number, because the mean of its divisors is an integer number (95320778).

Almost surely, 2^1225281660 is an apocalyptic number.

1225281660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225281660 is an abundant number, since it is smaller than the sum of its proper divisors (2206266348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225281660 is an frugal number, since it uses more digits than its factorization.

1225281660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9050 (or 4529 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1225281660 is about 35004.0234830226. The cubic root of 1225281660 is about 1070.0694804505.

The spelling of 1225281660 in words is "one billion, two hundred twenty-five million, two hundred eighty-one thousand, six hundred sixty".