1211219987 has 2 divisors, whose sum is σ = 1211219988. Its totient is φ = 1211219986.

The previous prime is 1211219983. The next prime is 1211220011. The reversal of 1211219987 is 7899121121.

It is a weak prime.

It is an emirp because it is prime and its reverse (7899121121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211219987 - 2² = 1211219983 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211219983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605609993 + 605609994.

It is an arithmetic number, because the mean of its divisors is an integer number (605609994).

Almost surely, 2^1211219987 is an apocalyptic number.

1211219987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211219987 is an equidigital number, since it uses as much as digits as its factorization.

1211219987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 41.

The square root of 1211219987 is about 34802.5859240373. The cubic root of 1211219987 is about 1065.9602489439.

The spelling of 1211219987 in words is "one billion, two hundred eleven million, two hundred nineteen thousand, nine hundred eighty-seven".