1187120155 has 8 divisors (see below), whose sum is σ = 1534124592. Its totient is φ = 876642528.

The previous prime is 1187120153. The next prime is 1187120159. The reversal of 1187120155 is 5510217811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1187120155 - 2¹ = 1187120153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1187120153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9131629 + ... + 9131758.

It is an arithmetic number, because the mean of its divisors is an integer number (191765574).

Almost surely, 2^1187120155 is an apocalyptic number.

1187120155 is a deficient number, since it is larger than the sum of its proper divisors (347004437).

1187120155 is a wasteful number, since it uses less digits than its factorization.

1187120155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18263405.

The product of its (nonzero) digits is 2800, while the sum is 31.

The square root of 1187120155 is about 34454.6100689008. The cubic root of 1187120155 is about 1058.8429748011.

Adding to 1187120155 its reverse (5510217811), we get a palindrome (6697337966).

The spelling of 1187120155 in words is "one billion, one hundred eighty-seven million, one hundred twenty thousand, one hundred fifty-five".