1111199987 has 2 divisors, whose sum is σ = 1111199988. Its totient is φ = 1111199986.

The previous prime is 1111199981. The next prime is 1111200001. The reversal of 1111199987 is 7899911111.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111199987 is a prime.

It is a super-2 number, since 2×1111199987² = 2469530822217600338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1111199981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555599993 + 555599994.

It is an arithmetic number, because the mean of its divisors is an integer number (555599994).

Almost surely, 2^1111199987 is an apocalyptic number.

1111199987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111199987 is an equidigital number, since it uses as much as digits as its factorization.

1111199987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 47.

The square root of 1111199987 is about 33334.6664450089. Note that the first 3 decimals coincide. The cubic root of 1111199987 is about 1035.7717837201.

The spelling of 1111199987 in words is "one billion, one hundred eleven million, one hundred ninety-nine thousand, nine hundred eighty-seven".