1155251011 has 6 divisors (see below), whose sum is σ = 1171756436. Its totient is φ = 1138974900.

The previous prime is 1155250961. The next prime is 1155251063. The reversal of 1155251011 is 1101525511.

It is a de Polignac number, because none of the positive numbers 2^k-1155251011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155258011) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 109545 + ... + 119626.

Almost surely, 2^1155251011 is an apocalyptic number.

1155251011 is a deficient number, since it is larger than the sum of its proper divisors (16505425).

1155251011 is an frugal number, since it uses more digits than its factorization.

1155251011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229313 (or 229242 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 22.

The square root of 1155251011 is about 33988.9836711838. The cubic root of 1155251011 is about 1049.2817494592.

Adding to 1155251011 its reverse (1101525511), we get a palindrome (2256776522).

The spelling of 1155251011 in words is "one billion, one hundred fifty-five million, two hundred fifty-one thousand, eleven".