1180009945 has 4 divisors (see below), whose sum is σ = 1416011940. Its totient is φ = 944007952.

The previous prime is 1180009939. The next prime is 1180009949. The reversal of 1180009945 is 5499000811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5499000811 = 41 ⋅134121971.

It can be written as a sum of positive squares in 2 ways, for example, as 275925321 + 904084624 = 16611^2 + 30068^2 .

It is a cyclic number.

It is not a de Polignac number, because 1180009945 - 2³ = 1180009937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1180009949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118000990 + ... + 118000999.

It is an arithmetic number, because the mean of its divisors is an integer number (354002985).

Almost surely, 2^1180009945 is an apocalyptic number.

It is an amenable number.

1180009945 is a deficient number, since it is larger than the sum of its proper divisors (236001995).

1180009945 is an equidigital number, since it uses as much as digits as its factorization.

1180009945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236001994.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 1180009945 is about 34351.2728294018. The cubic root of 1180009945 is about 1056.7247739222.

The spelling of 1180009945 in words is "one billion, one hundred eighty million, nine thousand, nine hundred forty-five".