311445145521 has 6 divisors (see below), whose sum is σ = 449865210210. Its totient is φ = 207630097008.

The previous prime is 311445145519. The next prime is 311445145549. The reversal of 311445145521 is 125541544113.

311445145521 is a `hidden beast` number, since 3 + 1 + 1 + 44 + 51 + 45 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 298525640625 + 12919504896 = 546375^2 + 113664^2 .

It is not a de Polignac number, because 311445145521 - 2¹ = 311445145519 is a prime.

It is a super-2 number, since 2×311445145521² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (311445145511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17302508076 + ... + 17302508093.

It is an arithmetic number, because the mean of its divisors is an integer number (74977535035).

Almost surely, 2^311445145521 is an apocalyptic number.

It is an amenable number.

311445145521 is a deficient number, since it is larger than the sum of its proper divisors (138420064689).

311445145521 is a wasteful number, since it uses less digits than its factorization.

311445145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34605016175 (or 34605016172 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 311445145521 its reverse (125541544113), we get a palindrome (436986689634).

The spelling of 311445145521 in words is "three hundred eleven billion, four hundred forty-five million, one hundred forty-five thousand, five hundred twenty-one".