431331421 has 4 divisors (see below), whose sum is σ = 435288700. Its totient is φ = 427374144.

The previous prime is 431331419. The next prime is 431331449. The reversal of 431331421 is 124133134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101727396 + 329604025 = 10086^2 + 18155^2 .

It is a cyclic number.

It is not a de Polignac number, because 431331421 - 2¹ = 431331419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431331392 and 431331401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431331221) 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, 1978476 + ... + 1978693.

It is an arithmetic number, because the mean of its divisors is an integer number (108822175).

Almost surely, 2^431331421 is an apocalyptic number.

It is an amenable number.

431331421 is a deficient number, since it is larger than the sum of its proper divisors (3957279).

431331421 is a wasteful number, since it uses less digits than its factorization.

431331421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957278.

The product of its digits is 864, while the sum is 22.

The square root of 431331421 is about 20768.5199520813. The cubic root of 431331421 is about 755.5624486019.

Adding to 431331421 its reverse (124133134), we get a palindrome (555464555).

The spelling of 431331421 in words is "four hundred thirty-one million, three hundred thirty-one thousand, four hundred twenty-one".