1311145251 has 8 divisors (see below), whose sum is σ = 1882670160. Its totient is φ = 806858592.

The previous prime is 1311145249. The next prime is 1311145271. The reversal of 1311145251 is 1525411131.

1311145251 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1311145251 - 2¹ = 1311145249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311145201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16809516 + ... + 16809593.

It is an arithmetic number, because the mean of its divisors is an integer number (235333770).

Almost surely, 2^1311145251 is an apocalyptic number.

1311145251 is a deficient number, since it is larger than the sum of its proper divisors (571524909).

1311145251 is a wasteful number, since it uses less digits than its factorization.

1311145251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33619125.

The product of its digits is 600, while the sum is 24.

The square root of 1311145251 is about 36209.7397256594. The cubic root of 1311145251 is about 1094.5029474021.

Adding to 1311145251 its reverse (1525411131), we get a palindrome (2836556382).

The spelling of 1311145251 in words is "one billion, three hundred eleven million, one hundred forty-five thousand, two hundred fifty-one".