311720261131 has 8 divisors (see below), whose sum is σ = 312898176224. Its totient is φ = 310542724800.

The previous prime is 311720261011. The next prime is 311720261197. The reversal of 311720261131 is 131162027113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311720261131 is a prime.

It is a super-2 number, since 2×311720261131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311720261131.

It is not an unprimeable number, because it can be changed into a prime (311720261231) 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, 1612351 + ... + 1795303.

It is an arithmetic number, because the mean of its divisors is an integer number (39112272028).

Almost surely, 2^311720261131 is an apocalyptic number.

311720261131 is a deficient number, since it is larger than the sum of its proper divisors (1177915093).

311720261131 is a wasteful number, since it uses less digits than its factorization.

311720261131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189381.

The product of its (nonzero) digits is 1512, while the sum is 28.

Adding to 311720261131 its reverse (131162027113), we get a palindrome (442882288244).

The spelling of 311720261131 in words is "three hundred eleven billion, seven hundred twenty million, two hundred sixty-one thousand, one hundred thirty-one".