1211110987 has 2 divisors, whose sum is σ = 1211110988. Its totient is φ = 1211110986.

The previous prime is 1211110949. The next prime is 1211111029. The reversal of 1211110987 is 7890111121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211110987 - 2²³ = 1202722379 is a prime.

It is a super-2 number, since 2×1211110987² = 2933579645664228338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211110907) by changing a digit.

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 as a sum of consecutive naturals, namely, 605555493 + 605555494.

It is an arithmetic number, because the mean of its divisors is an integer number (605555494).

Almost surely, 2^1211110987 is an apocalyptic number.

1211110987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211110987 is an equidigital number, since it uses as much as digits as its factorization.

1211110987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 31.

The square root of 1211110987 is about 34801.0199132152. The cubic root of 1211110987 is about 1065.9282720518.

The spelling of 1211110987 in words is "one billion, two hundred eleven million, one hundred ten thousand, nine hundred eighty-seven".