1153781755 has 64 divisors (see below), whose sum is σ = 1727889408. Its totient is φ = 721704960.

The previous prime is 1153781747. The next prime is 1153781819. The reversal of 1153781755 is 5571873511.

It is not a de Polignac number, because 1153781755 - 2³ = 1153781747 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3012294 + ... + 3012676.

It is an arithmetic number, because the mean of its divisors is an integer number (26998272).

Almost surely, 2^1153781755 is an apocalyptic number.

1153781755 is a deficient number, since it is larger than the sum of its proper divisors (574107653).

1153781755 is a wasteful number, since it uses less digits than its factorization.

1153781755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556.

The product of its digits is 147000, while the sum is 43.

The square root of 1153781755 is about 33967.3630857622. The cubic root of 1153781755 is about 1048.8367328872.

The spelling of 1153781755 in words is "one billion, one hundred fifty-three million, seven hundred eighty-one thousand, seven hundred fifty-five".