311031421 has 4 divisors (see below), whose sum is σ = 316303200. Its totient is φ = 305759644.

The previous prime is 311031407. The next prime is 311031437. The reversal of 311031421 is 124130113.

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.

It is a cyclic number.

It is not a de Polignac number, because 311031421 - 2¹⁹ = 310507133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311031395 and 311031404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311031451) 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, 2635801 + ... + 2635918.

It is an arithmetic number, because the mean of its divisors is an integer number (79075800).

Almost surely, 2^311031421 is an apocalyptic number.

It is an amenable number.

311031421 is a deficient number, since it is larger than the sum of its proper divisors (5271779).

311031421 is an equidigital number, since it uses as much as digits as its factorization.

311031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5271778.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 311031421 is about 17636.0829267726. The cubic root of 311031421 is about 677.5397114561.

Adding to 311031421 its reverse (124130113), we get a palindrome (435161534).

The spelling of 311031421 in words is "three hundred eleven million, thirty-one thousand, four hundred twenty-one".