1255785533 has 4 divisors (see below), whose sum is σ = 1310384928. Its totient is φ = 1201186140.

The previous prime is 1255785499. The next prime is 1255785539. The reversal of 1255785533 is 3355875521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3355875521 = 167 ⋅20095063.

It is a cyclic number.

It is not a de Polignac number, because 1255785533 - 2⁶ = 1255785469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255785539) 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, 27299663 + ... + 27299708.

It is an arithmetic number, because the mean of its divisors is an integer number (327596232).

Almost surely, 2^1255785533 is an apocalyptic number.

It is an amenable number.

1255785533 is a deficient number, since it is larger than the sum of its proper divisors (54599395).

1255785533 is an equidigital number, since it uses as much as digits as its factorization.

1255785533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54599394.

The product of its digits is 630000, while the sum is 44.

The square root of 1255785533 is about 35437.0643959118. The cubic root of 1255785533 is about 1078.8767279319.

The spelling of 1255785533 in words is "one billion, two hundred fifty-five million, seven hundred eighty-five thousand, five hundred thirty-three".