311221214545 has 8 divisors (see below), whose sum is σ = 375096312360. Its totient is φ = 247889735040.

The previous prime is 311221214497. The next prime is 311221214561. The reversal of 311221214545 is 545412122113.

It can be written as a sum of positive squares in 4 ways, for example, as 25321402129 + 285899812416 = 159127^2 + 534696^2 .

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

It is not a de Polignac number, because 311221214545 - 2¹⁷ = 311221083473 is a prime.

It is a super-3 number, since 3×311221214545³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135903316 + ... + 135905605.

It is an arithmetic number, because the mean of its divisors is an integer number (46887039045).

Almost surely, 2^311221214545 is an apocalyptic number.

It is an amenable number.

311221214545 is a deficient number, since it is larger than the sum of its proper divisors (63875097815).

311221214545 is a wasteful number, since it uses less digits than its factorization.

311221214545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271809155.

The product of its digits is 9600, while the sum is 31.

Adding to 311221214545 its reverse (545412122113), we get a palindrome (856633336658).

The spelling of 311221214545 in words is "three hundred eleven billion, two hundred twenty-one million, two hundred fourteen thousand, five hundred forty-five".