1161728311 has 2 divisors, whose sum is σ = 1161728312. Its totient is φ = 1161728310.

The previous prime is 1161728263. The next prime is 1161728333. The reversal of 1161728311 is 1138271611.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1161728311 - 2⁹ = 1161727799 is a prime.

It is a super-2 number, since 2×1161728311² = 2699225337157825442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161728011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580864155 + 580864156.

It is an arithmetic number, because the mean of its divisors is an integer number (580864156).

Almost surely, 2^1161728311 is an apocalyptic number.

1161728311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161728311 is an equidigital number, since it uses as much as digits as its factorization.

1161728311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 1161728311 is about 34084.1357672451. The cubic root of 1161728311 is about 1051.2391450744.

Adding to 1161728311 its reverse (1138271611), we get a palindrome (2299999922).

The spelling of 1161728311 in words is "one billion, one hundred sixty-one million, seven hundred twenty-eight thousand, three hundred eleven".