1191140361 has 6 divisors (see below), whose sum is σ = 1720536090. Its totient is φ = 794093568.

The previous prime is 1191140347. The next prime is 1191140407. The reversal of 1191140361 is 1630411911.

It can be written as a sum of positive squares in only one way, i.e., 874976400 + 316163961 = 29580^2 + 17781^2 .

It is not a de Polignac number, because 1191140361 - 2¹³ = 1191132169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1191140861) 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 in 5 ways as a sum of consecutive naturals, for example, 66174456 + ... + 66174473.

It is an arithmetic number, because the mean of its divisors is an integer number (286756015).

Almost surely, 2^1191140361 is an apocalyptic number.

It is an amenable number.

1191140361 is a deficient number, since it is larger than the sum of its proper divisors (529395729).

1191140361 is a wasteful number, since it uses less digits than its factorization.

1191140361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132348935 (or 132348932 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1191140361 is about 34512.9013703571. The cubic root of 1191140361 is about 1060.0368923317.

The spelling of 1191140361 in words is "one billion, one hundred ninety-one million, one hundred forty thousand, three hundred sixty-one".