311520531145 has 8 divisors (see below), whose sum is σ = 382518233856. Its totient is φ = 243420693936.

The previous prime is 311520531079. The next prime is 311520531169. The reversal of 311520531145 is 541135025113.

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

It is a cyclic number.

It is not a de Polignac number, because 311520531145 - 2³¹ = 309373047497 is a prime.

It is a super-2 number, since 2×311520531145² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

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, 724466137 + ... + 724466566.

It is an arithmetic number, because the mean of its divisors is an integer number (47814779232).

Almost surely, 2^311520531145 is an apocalyptic number.

It is an amenable number.

311520531145 is a deficient number, since it is larger than the sum of its proper divisors (70997702711).

311520531145 is a wasteful number, since it uses less digits than its factorization.

311520531145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448932751.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 311520531145 its reverse (541135025113), we get a palindrome (852655556258).

The spelling of 311520531145 in words is "three hundred eleven billion, five hundred twenty million, five hundred thirty-one thousand, one hundred forty-five".