1187111577689 has 2 divisors, whose sum is σ = 1187111577690. Its totient is φ = 1187111577688.

The previous prime is 1187111577667. The next prime is 1187111577697. The reversal of 1187111577689 is 9867751117811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 995788443664 + 191323134025 = 997892^2 + 437405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187111577689 - 2²⁰ = 1187110529113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1187111577089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593555788844 + 593555788845.

It is an arithmetic number, because the mean of its divisors is an integer number (593555788845).

Almost surely, 2^{1187111577689} is an apocalyptic number.

It is an amenable number.

1187111577689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187111577689 is an equidigital number, since it uses as much as digits as its factorization.

1187111577689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 62.

The spelling of 1187111577689 in words is "one trillion, one hundred eighty-seven billion, one hundred eleven million, five hundred seventy-seven thousand, six hundred eighty-nine".