1181487911 has 2 divisors, whose sum is σ = 1181487912. Its totient is φ = 1181487910.

The previous prime is 1181487877. The next prime is 1181487953. The reversal of 1181487911 is 1197841811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1181487911 - 2²⁶ = 1114379047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1181487961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590743955 + 590743956.

It is an arithmetic number, because the mean of its divisors is an integer number (590743956).

Almost surely, 2^1181487911 is an apocalyptic number.

1181487911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181487911 is an equidigital number, since it uses as much as digits as its factorization.

1181487911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 41.

The square root of 1181487911 is about 34372.7786336805. The cubic root of 1181487911 is about 1057.1657735067.

The spelling of 1181487911 in words is "one billion, one hundred eighty-one million, four hundred eighty-seven thousand, nine hundred eleven".