1187105849 has 2 divisors, whose sum is σ = 1187105850. Its totient is φ = 1187105848.

The previous prime is 1187105809. The next prime is 1187105851. The reversal of 1187105849 is 9485017811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1126810624 + 60295225 = 33568^2 + 7765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1187105849 is a prime.

It is a super-3 number, since 3×1187105849³ (a number of 28 digits) contains 333 as substring.

Together with 1187105851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1187105809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593552924 + 593552925.

It is an arithmetic number, because the mean of its divisors is an integer number (593552925).

Almost surely, 2^1187105849 is an apocalyptic number.

It is an amenable number.

1187105849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187105849 is an equidigital number, since it uses as much as digits as its factorization.

1187105849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 44.

The square root of 1187105849 is about 34454.4024618045. The cubic root of 1187105849 is about 1058.8387214074.

The spelling of 1187105849 in words is "one billion, one hundred eighty-seven million, one hundred five thousand, eight hundred forty-nine".