1311025145 has 8 divisors (see below), whose sum is σ = 1593144960. Its totient is φ = 1035543600.

The previous prime is 1311025141. The next prime is 1311025187. The reversal of 1311025145 is 5415201131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311025145 - 2² = 1311025141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311025145.

It is not an unprimeable number, because it can be changed into a prime (1311025141) 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 7 ways as a sum of consecutive naturals, for example, 1659131 + ... + 1659920.

It is an arithmetic number, because the mean of its divisors is an integer number (199143120).

Almost surely, 2^1311025145 is an apocalyptic number.

It is an amenable number.

1311025145 is a deficient number, since it is larger than the sum of its proper divisors (282119815).

1311025145 is an equidigital number, since it uses as much as digits as its factorization.

1311025145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319135.

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

The square root of 1311025145 is about 36208.0812112434. The cubic root of 1311025145 is about 1094.4695261405.

Adding to 1311025145 its reverse (5415201131), we get a palindrome (6726226276).

The spelling of 1311025145 in words is "one billion, three hundred eleven million, twenty-five thousand, one hundred forty-five".