1255091011 has 16 divisors (see below), whose sum is σ = 1360558080. Its totient is φ = 1153411200.

The previous prime is 1255091003. The next prime is 1255091021. The reversal of 1255091011 is 1101905521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1255091011 - 2³ = 1255091003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255091021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147310 + ... + 155596.

It is an arithmetic number, because the mean of its divisors is an integer number (85034880).

Almost surely, 2^1255091011 is an apocalyptic number.

1255091011 is a deficient number, since it is larger than the sum of its proper divisors (105467069).

1255091011 is a wasteful number, since it uses less digits than its factorization.

1255091011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8514.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 1255091011 is about 35427.2636679719. The cubic root of 1255091011 is about 1078.6777975196.

Adding to 1255091011 its reverse (1101905521), we get a palindrome (2356996532).

The spelling of 1255091011 in words is "one billion, two hundred fifty-five million, ninety-one thousand, eleven".