1145520311 has 4 divisors (see below), whose sum is σ = 1233637272. Its totient is φ = 1057403352.

The previous prime is 1145520283. The next prime is 1145520347. The reversal of 1145520311 is 1130255411.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1145520311 - 2¹⁴ = 1145503927 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 (1145520391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44058461 + ... + 44058486.

It is an arithmetic number, because the mean of its divisors is an integer number (308409318).

Almost surely, 2^1145520311 is an apocalyptic number.

1145520311 is a deficient number, since it is larger than the sum of its proper divisors (88116961).

1145520311 is an equidigital number, since it uses as much as digits as its factorization.

1145520311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88116960.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1145520311 is about 33845.5360572114. The cubic root of 1145520311 is about 1046.3273993500.

Adding to 1145520311 its reverse (1130255411), we get a palindrome (2275775722).

The spelling of 1145520311 in words is "one billion, one hundred forty-five million, five hundred twenty thousand, three hundred eleven".