1151205311 has 4 divisors (see below), whose sum is σ = 1151278824. Its totient is φ = 1151131800.

The previous prime is 1151205277. The next prime is 1151205317. The reversal of 1151205311 is 1135021511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1151205311 - 2²² = 1147011007 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 (1151205317) 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, 2825 + ... + 48066.

It is an arithmetic number, because the mean of its divisors is an integer number (287819706).

Almost surely, 2^1151205311 is an apocalyptic number.

1151205311 is a deficient number, since it is larger than the sum of its proper divisors (73513).

1151205311 is an equidigital number, since it uses as much as digits as its factorization.

1151205311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73512.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 1151205311 is about 33929.4166027063. The cubic root of 1151205311 is about 1048.0554519612.

Adding to 1151205311 its reverse (1135021511), we get a palindrome (2286226822).

The spelling of 1151205311 in words is "one billion, one hundred fifty-one million, two hundred five thousand, three hundred eleven".