1211645330 has 32 divisors (see below), whose sum is σ = 2505081600. Its totient is φ = 413328960.

The previous prime is 1211645329. The next prime is 1211645339. The reversal of 1211645330 is 335461121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211645330.

It is not an unprimeable number, because it can be changed into a prime (1211645339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29561 + ... + 57420.

It is an arithmetic number, because the mean of its divisors is an integer number (78283800).

Almost surely, 2^1211645330 is an apocalyptic number.

1211645330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211645330 is an abundant number, since it is smaller than the sum of its proper divisors (1293436270).

1211645330 is a wasteful number, since it uses less digits than its factorization.

1211645330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87194.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1211645330 is about 34808.6961835688. The cubic root of 1211645330 is about 1066.0850117649.

The spelling of 1211645330 in words is "one billion, two hundred eleven million, six hundred forty-five thousand, three hundred thirty".