8145981787 has 2 divisors, whose sum is σ = 8145981788. Its totient is φ = 8145981786.

The previous prime is 8145981761. The next prime is 8145981821. The reversal of 8145981787 is 7871895418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8145981787 - 2⁷ = 8145981659 is a prime.

It is not a weakly prime, because it can be changed into another prime (8145921787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4072990893 + 4072990894.

It is an arithmetic number, because the mean of its divisors is an integer number (4072990894).

Almost surely, 2^8145981787 is an apocalyptic number.

8145981787 is a deficient number, since it is larger than the sum of its proper divisors (1).

8145981787 is an equidigital number, since it uses as much as digits as its factorization.

8145981787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 58.

The square root of 8145981787 is about 90255.0928590736. The cubic root of 8145981787 is about 2012.0918946252.

The spelling of 8145981787 in words is "eight billion, one hundred forty-five million, nine hundred eighty-one thousand, seven hundred eighty-seven".