1191655086 has 48 divisors (see below), whose sum is σ = 2543654640. Its totient is φ = 372096000.

The previous prime is 1191655079. The next prime is 1191655109. The reversal of 1191655086 is 6805561911.

1191655086 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 395586 + ... + 398586.

It is an arithmetic number, because the mean of its divisors is an integer number (52992805).

Almost surely, 2^1191655086 is an apocalyptic number.

1191655086 is an abundant number, since it is smaller than the sum of its proper divisors (1351999554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1191655086 is a wasteful number, since it uses less digits than its factorization.

1191655086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269 (or 3252 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 1191655086 is about 34520.3575589825. The cubic root of 1191655086 is about 1060.1895608536.

It can be divided in two parts, 119165 and 5086, that added together give a triangular number (124251 = T₄₉₈).

The spelling of 1191655086 in words is "one billion, one hundred ninety-one million, six hundred fifty-five thousand, eighty-six".