1205645133 has 32 divisors (see below), whose sum is σ = 2109680640. Its totient is φ = 593343360.

The previous prime is 1205645047. The next prime is 1205645141. The reversal of 1205645133 is 3315465021.

It is not a de Polignac number, because 1205645133 - 2¹³ = 1205636941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1205645133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205645143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132960 + ... + 141737.

It is an arithmetic number, because the mean of its divisors is an integer number (65927520).

Almost surely, 2^1205645133 is an apocalyptic number.

It is an amenable number.

1205645133 is a deficient number, since it is larger than the sum of its proper divisors (904035507).

1205645133 is a wasteful number, since it uses less digits than its factorization.

1205645133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274737.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 1205645133 is about 34722.4010258507. The cubic root of 1205645133 is about 1064.3223099365.

The spelling of 1205645133 in words is "one billion, two hundred five million, six hundred forty-five thousand, one hundred thirty-three".