1188253649 has 4 divisors (see below), whose sum is σ = 1296276720. Its totient is φ = 1080230580.

The previous prime is 1188253637. The next prime is 1188253663. The reversal of 1188253649 is 9463528811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1188253649 - 2¹² = 1188249553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1188223649) 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 3 ways as a sum of consecutive naturals, for example, 54011519 + ... + 54011540.

It is an arithmetic number, because the mean of its divisors is an integer number (324069180).

Almost surely, 2^1188253649 is an apocalyptic number.

It is an amenable number.

1188253649 is a deficient number, since it is larger than the sum of its proper divisors (108023071).

1188253649 is a wasteful number, since it uses less digits than its factorization.

1188253649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108023070.

The product of its digits is 414720, while the sum is 47.

The square root of 1188253649 is about 34471.0552347908. The cubic root of 1188253649 is about 1059.1798714397.

The spelling of 1188253649 in words is "one billion, one hundred eighty-eight million, two hundred fifty-three thousand, six hundred forty-nine".