1172240645 has 4 divisors (see below), whose sum is σ = 1406688780. Its totient is φ = 937792512.

The previous prime is 1172240617. The next prime is 1172240647. The reversal of 1172240645 is 5460422711.

It is a Cunningham number, because it is equal to 34238²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 421973764 + 750266881 = 20542^2 + 27391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1172240645 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1172240647) 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, 117224060 + ... + 117224069.

It is an arithmetic number, because the mean of its divisors is an integer number (351672195).

Almost surely, 2^1172240645 is an apocalyptic number.

It is an amenable number.

1172240645 is a deficient number, since it is larger than the sum of its proper divisors (234448135).

1172240645 is an equidigital number, since it uses as much as digits as its factorization.

1172240645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234448134.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 1172240645 is about 34238.0000146037. Note that the first 4 decimals coincide. The cubic root of 1172240645 is about 1054.4004724689.

The spelling of 1172240645 in words is "one billion, one hundred seventy-two million, two hundred forty thousand, six hundred forty-five".