2191124587 has 2 divisors, whose sum is σ = 2191124588. Its totient is φ = 2191124586.

The previous prime is 2191124581. The next prime is 2191124597. The reversal of 2191124587 is 7854211912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2191124587 - 2¹¹ = 2191122539 is a prime.

It is not a weakly prime, because it can be changed into another prime (2191124581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095562293 + 1095562294.

It is an arithmetic number, because the mean of its divisors is an integer number (1095562294).

Almost surely, 2^2191124587 is an apocalyptic number.

2191124587 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191124587 is an equidigital number, since it uses as much as digits as its factorization.

2191124587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The square root of 2191124587 is about 46809.4497617735. The cubic root of 2191124587 is about 1298.8401068416.

The spelling of 2191124587 in words is "two billion, one hundred ninety-one million, one hundred twenty-four thousand, five hundred eighty-seven".