1187849917 has 2 divisors, whose sum is σ = 1187849918. Its totient is φ = 1187849916.

The previous prime is 1187849879. The next prime is 1187849933. The reversal of 1187849917 is 7199487811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1046263716 + 141586201 = 32346^2 + 11899^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187849917 - 2²⁷ = 1053632189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187849987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593924958 + 593924959.

It is an arithmetic number, because the mean of its divisors is an integer number (593924959).

Almost surely, 2^1187849917 is an apocalyptic number.

It is an amenable number.

1187849917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187849917 is an equidigital number, since it uses as much as digits as its factorization.

1187849917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 55.

The square root of 1187849917 is about 34465.1986357253. The cubic root of 1187849917 is about 1059.0598989494.

The spelling of 1187849917 in words is "one billion, one hundred eighty-seven million, eight hundred forty-nine thousand, nine hundred seventeen".