311443636145 has 4 divisors (see below), whose sum is σ = 373732363380. Its totient is φ = 249154908912.

The previous prime is 311443636129. The next prime is 311443636171. The reversal of 311443636145 is 541636344113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 247721216656 + 63722419489 = 497716^2 + 252433^2 .

It is a cyclic number.

It is not a de Polignac number, because 311443636145 - 2⁴ = 311443636129 is a prime.

It is a super-2 number, since 2×311443636145² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31144363610 + ... + 31144363619.

It is an arithmetic number, because the mean of its divisors is an integer number (93433090845).

Almost surely, 2^311443636145 is an apocalyptic number.

It is an amenable number.

311443636145 is a deficient number, since it is larger than the sum of its proper divisors (62288727235).

311443636145 is an equidigital number, since it uses as much as digits as its factorization.

311443636145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62288727234.

The product of its digits is 311040, while the sum is 41.

The spelling of 311443636145 in words is "three hundred eleven billion, four hundred forty-three million, six hundred thirty-six thousand, one hundred forty-five".