311145421 has 4 divisors (see below), whose sum is σ = 312159232. Its totient is φ = 310131612.

The previous prime is 311145391. The next prime is 311145479. The reversal of 311145421 is 124541113.

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 311145421 - 2⁷ = 311145293 is a prime.

It is a super-2 number, since 2×311145421² = 193622946018534482, 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 = 311145392 and 311145401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311148421) 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, 506445 + ... + 507058.

It is an arithmetic number, because the mean of its divisors is an integer number (78039808).

Almost surely, 2^311145421 is an apocalyptic number.

It is an amenable number.

311145421 is a deficient number, since it is larger than the sum of its proper divisors (1013811).

311145421 is a wasteful number, since it uses less digits than its factorization.

311145421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013810.

The product of its digits is 480, while the sum is 22.

The square root of 311145421 is about 17639.3146408810. The cubic root of 311145421 is about 677.6224791843.

Adding to 311145421 its reverse (124541113), we get a palindrome (435686534).

The spelling of 311145421 in words is "three hundred eleven million, one hundred forty-five thousand, four hundred twenty-one".