311361213 has 4 divisors (see below), whose sum is σ = 415148288. Its totient is φ = 207574140.

The previous prime is 311361209. The next prime is 311361247. The reversal of 311361213 is 312163113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 312163113 = 3 ⋅104054371.

It is not a de Polignac number, because 311361213 - 2² = 311361209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311361213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311361293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51893533 + ... + 51893538.

It is an arithmetic number, because the mean of its divisors is an integer number (103787072).

Almost surely, 2^311361213 is an apocalyptic number.

It is an amenable number.

311361213 is a deficient number, since it is larger than the sum of its proper divisors (103787075).

311361213 is a wasteful number, since it uses less digits than its factorization.

311361213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103787074.

The product of its digits is 324, while the sum is 21.

The square root of 311361213 is about 17645.4303716288. The cubic root of 311361213 is about 677.7790958966.

The spelling of 311361213 in words is "three hundred eleven million, three hundred sixty-one thousand, two hundred thirteen".