4311987612991 has 4 divisors (see below), whose sum is σ = 4312767786352. Its totient is φ = 4311207439632.

The previous prime is 4311987612953. The next prime is 4311987613027. The reversal of 4311987612991 is 1992167891134.

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 4311987612991 - 2¹⁵ = 4311987580223 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 (4311987612901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390078390 + ... + 390089443.

It is an arithmetic number, because the mean of its divisors is an integer number (1078191946588).

Almost surely, 2^{4311987612991} is an apocalyptic number.

4311987612991 is a deficient number, since it is larger than the sum of its proper divisors (780173361).

4311987612991 is an equidigital number, since it uses as much as digits as its factorization.

4311987612991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780173360.

The product of its digits is 5878656, while the sum is 61.

The spelling of 4311987612991 in words is "four trillion, three hundred eleven billion, nine hundred eighty-seven million, six hundred twelve thousand, nine hundred ninety-one".