311431421 has 16 divisors (see below), whose sum is σ = 361236480. Its totient is φ = 262984320.

The previous prime is 311431411. The next prime is 311431433. The reversal of 311431421 is 124134113.

It is a cyclic number.

It is not a de Polignac number, because 311431421 - 2¹⁴ = 311415037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 311431393 and 311431402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311431411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144665 + ... + 146801.

It is an arithmetic number, because the mean of its divisors is an integer number (22577280).

Almost surely, 2^311431421 is an apocalyptic number.

It is an amenable number.

311431421 is a deficient number, since it is larger than the sum of its proper divisors (49805059).

311431421 is a wasteful number, since it uses less digits than its factorization.

311431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444.

The product of its digits is 288, while the sum is 20.

The square root of 311431421 is about 17647.4196697421. The cubic root of 311431421 is about 677.8300355947.

Adding to 311431421 its reverse (124134113), we get a palindrome (435565534).

The spelling of 311431421 in words is "three hundred eleven million, four hundred thirty-one thousand, four hundred twenty-one".