311040421 has 4 divisors (see below), whose sum is σ = 315421344. Its totient is φ = 306659500.

The previous prime is 311040413. The next prime is 311040451. The reversal of 311040421 is 124040113.

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 311040421 - 2³ = 311040413 is a prime.

It is a super-2 number, since 2×311040421² = 193492286991714482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311040395 and 311040404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311040451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2190355 + ... + 2190496.

It is an arithmetic number, because the mean of its divisors is an integer number (78855336).

Almost surely, 2^311040421 is an apocalyptic number.

It is an amenable number.

311040421 is a deficient number, since it is larger than the sum of its proper divisors (4380923).

311040421 is an equidigital number, since it uses as much as digits as its factorization.

311040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380922.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 311040421 is about 17636.3380836272. The cubic root of 311040421 is about 677.5462464857.

Adding to 311040421 its reverse (124040113), we get a palindrome (435080534).

The spelling of 311040421 in words is "three hundred eleven million, forty thousand, four hundred twenty-one".