311420813 has 4 divisors (see below), whose sum is σ = 339731808. Its totient is φ = 283109820.

The previous prime is 311420803. The next prime is 311420819. The reversal of 311420813 is 318024113.

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: 318024113 = 11 ⋅28911283.

It is a cyclic number.

It is not a de Polignac number, because 311420813 - 2¹⁰ = 311419789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311420819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14155481 + ... + 14155502.

It is an arithmetic number, because the mean of its divisors is an integer number (84932952).

Almost surely, 2^311420813 is an apocalyptic number.

It is an amenable number.

311420813 is a deficient number, since it is larger than the sum of its proper divisors (28310995).

311420813 is a wasteful number, since it uses less digits than its factorization.

311420813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28310994.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 311420813 is about 17647.1191133284. The cubic root of 311420813 is about 677.8223394084.

Adding to 311420813 its reverse (318024113), we get a palindrome (629444926).

It can be divided in two parts, 311 and 420813, that added together give a palindrome (421124).

The spelling of 311420813 in words is "three hundred eleven million, four hundred twenty thousand, eight hundred thirteen".