1811248987 has 2 divisors, whose sum is σ = 1811248988. Its totient is φ = 1811248986.

The previous prime is 1811248949. The next prime is 1811249009. The reversal of 1811248987 is 7898421181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1811248987 - 2²⁷ = 1677031259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1811248987.

It is not a weakly prime, because it can be changed into another prime (1811248487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905624493 + 905624494.

It is an arithmetic number, because the mean of its divisors is an integer number (905624494).

Almost surely, 2^1811248987 is an apocalyptic number.

1811248987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811248987 is an equidigital number, since it uses as much as digits as its factorization.

1811248987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 49.

The square root of 1811248987 is about 42558.7709761454. The cubic root of 1811248987 is about 1218.9691612638.

The spelling of 1811248987 in words is "one billion, eight hundred eleven million, two hundred forty-eight thousand, nine hundred eighty-seven".