311145125720 has 96 divisors (see below), whose sum is σ = 828698517360. Its totient is φ = 104440300800.

The previous prime is 311145125719. The next prime is 311145125729. The reversal of 311145125720 is 27521541113.

It is a super-2 number, since 2×311145125720² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311145125729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2409626 + ... + 2535465.

Almost surely, 2^311145125720 is an apocalyptic number.

It is an amenable number.

311145125720 is an abundant number, since it is smaller than the sum of its proper divisors (517553391640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311145125720 is a wasteful number, since it uses less digits than its factorization.

311145125720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4945137 (or 4945122 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

Adding to 311145125720 its reverse (27521541113), we get a palindrome (338666666833).

The spelling of 311145125720 in words is "three hundred eleven billion, one hundred forty-five million, one hundred twenty-five thousand, seven hundred twenty".