1211491456 has 32 divisors (see below), whose sum is σ = 2758308480. Its totient is φ = 519210240.

The previous prime is 1211491441. The next prime is 1211491483. The reversal of 1211491456 is 6541941121.

It is a tau number, because it is divible by the number of its divisors (32).

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 3 ways as a sum of consecutive naturals, for example, 675160 + ... + 676951.

It is an arithmetic number, because the mean of its divisors is an integer number (86197140).

Almost surely, 2^1211491456 is an apocalyptic number.

1211491456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1211491456 is an abundant number, since it is smaller than the sum of its proper divisors (1546817024).

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

1211491456 is an equidigital number, since it uses as much as digits as its factorization.

1211491456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352132 (or 1352120 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 1211491456 is about 34806.4858323847. The cubic root of 1211491456 is about 1066.0398803760.

The spelling of 1211491456 in words is "one billion, two hundred eleven million, four hundred ninety-one thousand, four hundred fifty-six".