1211445988 has 6 divisors (see below), whose sum is σ = 2120030486. Its totient is φ = 605722992.

The previous prime is 1211445941. The next prime is 1211446001. The reversal of 1211445988 is 8895441121.

It can be written as a sum of positive squares in only one way, i.e., 633428224 + 578017764 = 25168^2 + 24042^2 .

It is a super-3 number, since 3×1211445988³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 151430745 + ... + 151430752.

Almost surely, 2^1211445988 is an apocalyptic number.

It is an amenable number.

1211445988 is a deficient number, since it is larger than the sum of its proper divisors (908584498).

1211445988 is a wasteful number, since it uses less digits than its factorization.

1211445988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302861501 (or 302861499 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 1211445988 is about 34805.8326721255. The cubic root of 1211445988 is about 1066.0265438374.

The spelling of 1211445988 in words is "one billion, two hundred eleven million, four hundred forty-five thousand, nine hundred eighty-eight".