1081917787 has 2 divisors, whose sum is σ = 1081917788. Its totient is φ = 1081917786.

The previous prime is 1081917691. The next prime is 1081917803. The reversal of 1081917787 is 7877191801.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081917787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1081917787.

It is not a weakly prime, because it can be changed into another prime (1081918787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540958893 + 540958894.

It is an arithmetic number, because the mean of its divisors is an integer number (540958894).

Almost surely, 2^1081917787 is an apocalyptic number.

1081917787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081917787 is an equidigital number, since it uses as much as digits as its factorization.

1081917787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 49.

The square root of 1081917787 is about 32892.5187086669. The cubic root of 1081917787 is about 1026.5924995733.

The spelling of 1081917787 in words is "one billion, eighty-one million, nine hundred seventeen thousand, seven hundred eighty-seven".