1178091649 has 16 divisors (see below), whose sum is σ = 1361647872. Its totient is φ = 998382528.

The previous prime is 1178091643. The next prime is 1178091659. The reversal of 1178091649 is 9461908711.

It is a cyclic number.

It is not a de Polignac number, because 1178091649 - 2³ = 1178091641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1178091599 and 1178091608.

It is not an unprimeable number, because it can be changed into a prime (1178091641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 729567 + ... + 731179.

It is an arithmetic number, because the mean of its divisors is an integer number (85102992).

Almost surely, 2^1178091649 is an apocalyptic number.

It is an amenable number.

1178091649 is a deficient number, since it is larger than the sum of its proper divisors (183556223).

1178091649 is a wasteful number, since it uses less digits than its factorization.

1178091649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 1178091649 is about 34323.3397122133. The cubic root of 1178091649 is about 1056.1518379698.

The spelling of 1178091649 in words is "one billion, one hundred seventy-eight million, ninety-one thousand, six hundred forty-nine".