1211649986 has 16 divisors (see below), whose sum is σ = 1883183040. Its totient is φ = 583989840.

The previous prime is 1211649979. The next prime is 1211649997. The reversal of 1211649986 is 6899461121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211649986.

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 in 7 ways as a sum of consecutive naturals, for example, 20045 + ... + 53151.

It is an arithmetic number, because the mean of its divisors is an integer number (117698940).

Almost surely, 2^1211649986 is an apocalyptic number.

1211649986 is a deficient number, since it is larger than the sum of its proper divisors (671533054).

1211649986 is a wasteful number, since it uses less digits than its factorization.

1211649986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33769.

The product of its digits is 186624, while the sum is 47.

The square root of 1211649986 is about 34808.7630633437. The cubic root of 1211649986 is about 1066.0863773145.

The spelling of 1211649986 in words is "one billion, two hundred eleven million, six hundred forty-nine thousand, nine hundred eighty-six".