311213430 has 48 divisors (see below), whose sum is σ = 882717264. Its totient is φ = 75445440.

The previous prime is 311213359. The next prime is 311213443. The reversal of 311213430 is 34312113.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156189 + ... + 158168.

It is an arithmetic number, because the mean of its divisors is an integer number (18389943).

Almost surely, 2^311213430 is an apocalyptic number.

311213430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

311213430 is an abundant number, since it is smaller than the sum of its proper divisors (571503834).

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

311213430 is a wasteful number, since it uses less digits than its factorization.

311213430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314381 (or 314378 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 311213430 is about 17641.2423031940. The cubic root of 311213430 is about 677.6718463150.

Adding to 311213430 its reverse (34312113), we get a palindrome (345525543).

The spelling of 311213430 in words is "three hundred eleven million, two hundred thirteen thousand, four hundred thirty".