1211103987 has 16 divisors (see below), whose sum is σ = 1749559680. Its totient is φ = 742234752.

The previous prime is 1211103979. The next prime is 1211104009. The reversal of 1211103987 is 7893011121.

It is not a de Polignac number, because 1211103987 - 2³ = 1211103979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211103917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273937 + ... + 278322.

It is an arithmetic number, because the mean of its divisors is an integer number (109347480).

Almost surely, 2^1211103987 is an apocalyptic number.

1211103987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1211103987 is a deficient number, since it is larger than the sum of its proper divisors (538455693).

1211103987 is a wasteful number, since it uses less digits than its factorization.

1211103987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552322.

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 1211103987 is about 34800.9193413048. The cubic root of 1211103987 is about 1065.9262184243.

The spelling of 1211103987 in words is "one billion, two hundred eleven million, one hundred three thousand, nine hundred eighty-seven".