311213151020 has 24 divisors (see below), whose sum is σ = 668746400784. Its totient is φ = 121590254016.

The previous prime is 311213151017. The next prime is 311213151023. The reversal of 311213151020 is 20151312113.

It is an interprime number because it is at equal distance from previous prime (311213151017) and next prime (311213151023).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 311213150983 and 311213151001.

It is not an unprimeable number, because it can be changed into a prime (311213151023) 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, 180937019 + ... + 180938738.

It is an arithmetic number, because the mean of its divisors is an integer number (27864433366).

Almost surely, 2^311213151020 is an apocalyptic number.

It is an amenable number.

311213151020 is an abundant number, since it is smaller than the sum of its proper divisors (357533249764).

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

311213151020 is a wasteful number, since it uses less digits than its factorization.

311213151020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361875809 (or 361875807 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 311213151020 its reverse (20151312113), we get a palindrome (331364463133).

The spelling of 311213151020 in words is "three hundred eleven billion, two hundred thirteen million, one hundred fifty-one thousand, twenty".