1129649191 has 4 divisors (see below), whose sum is σ = 1232344584. Its totient is φ = 1026953800.

The previous prime is 1129649189. The next prime is 1129649219. The reversal of 1129649191 is 1919469211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1919469211 = 11 ⋅174497201.

It is a cyclic number.

It is not a de Polignac number, because 1129649191 - 2¹ = 1129649189 is a prime.

It is a super-2 number, since 2×1129649191² = 2552214589453908962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129649111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51347680 + ... + 51347701.

It is an arithmetic number, because the mean of its divisors is an integer number (308086146).

Almost surely, 2^1129649191 is an apocalyptic number.

1129649191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1129649191 is a deficient number, since it is larger than the sum of its proper divisors (102695393).

1129649191 is a wasteful number, since it uses less digits than its factorization.

1129649191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102695392.

The product of its digits is 34992, while the sum is 43.

The square root of 1129649191 is about 33610.2542537244. The cubic root of 1129649191 is about 1041.4726397813.

The spelling of 1129649191 in words is "one billion, one hundred twenty-nine million, six hundred forty-nine thousand, one hundred ninety-one".