1204642645 has 4 divisors (see below), whose sum is σ = 1445571180. Its totient is φ = 963714112.

The previous prime is 1204642591. The next prime is 1204642657. The reversal of 1204642645 is 5462464021.

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 503822916 + 700819729 = 22446^2 + 26473^2 .

It is a cyclic number.

It is not a de Polignac number, because 1204642645 - 2²⁵ = 1171088213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1204642645.

It is a congruent number.

It is an unprimeable number.

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, 120464260 + ... + 120464269.

It is an arithmetic number, because the mean of its divisors is an integer number (361392795).

Almost surely, 2^1204642645 is an apocalyptic number.

It is an amenable number.

1204642645 is a deficient number, since it is larger than the sum of its proper divisors (240928535).

1204642645 is an equidigital number, since it uses as much as digits as its factorization.

1204642645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240928534.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 1204642645 is about 34707.9622709257. The cubic root of 1204642645 is about 1064.0272352145.

The spelling of 1204642645 in words is "one billion, two hundred four million, six hundred forty-two thousand, six hundred forty-five".