1191222945 has 48 divisors (see below), whose sum is σ = 2289478464. Its totient is φ = 568080000.

The previous prime is 1191222919. The next prime is 1191222947. The reversal of 1191222945 is 5492221911.

It is not a de Polignac number, because 1191222945 - 2⁷ = 1191222817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1191222947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10470 + ... + 49920.

It is an arithmetic number, because the mean of its divisors is an integer number (47697468).

Almost surely, 2^1191222945 is an apocalyptic number.

1191222945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1191222945 is a deficient number, since it is larger than the sum of its proper divisors (1098255519).

1191222945 is a wasteful number, since it uses less digits than its factorization.

1191222945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39534 (or 39531 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1191222945 is about 34514.0977717802. The cubic root of 1191222945 is about 1060.0613898823.

The spelling of 1191222945 in words is "one billion, one hundred ninety-one million, two hundred twenty-two thousand, nine hundred forty-five".