1187371861389 has 20 divisors (see below), whose sum is σ = 2027118099424. Its totient is φ = 678498206184.

The previous prime is 1187371861369. The next prime is 1187371861399. The reversal of 1187371861389 is 9831681737811.

1187371861389 is a `hidden beast` number, since 1 + 1 + 8 + 7 + 3 + 7 + 1 + 8 + 613 + 8 + 9 = 666.

It is not a de Polignac number, because 1187371861389 - 2⁷ = 1187371861261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187371861339) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1047064567 + ... + 1047065700.

Almost surely, 2^{1187371861389} is an apocalyptic number.

It is an amenable number.

1187371861389 is a deficient number, since it is larger than the sum of its proper divisors (839746238035).

1187371861389 is an equidigital number, since it uses as much as digits as its factorization.

1187371861389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094130286 (or 2094130277 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The spelling of 1187371861389 in words is "one trillion, one hundred eighty-seven billion, three hundred seventy-one million, eight hundred sixty-one thousand, three hundred eighty-nine".