431235421 has 2 divisors, whose sum is σ = 431235422. Its totient is φ = 431235420.

The previous prime is 431235391. The next prime is 431235439. The reversal of 431235421 is 124532134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329023321 + 102212100 = 18139^2 + 10110^2 .

It is a cyclic number.

It is not a de Polignac number, because 431235421 - 2²³ = 422846813 is a prime.

It is equal to p_22910209 and since 431235421 and 22910209 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431235461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215617710 + 215617711.

It is an arithmetic number, because the mean of its divisors is an integer number (215617711).

Almost surely, 2^431235421 is an apocalyptic number.

It is an amenable number.

431235421 is a deficient number, since it is larger than the sum of its proper divisors (1).

431235421 is an equidigital number, since it uses as much as digits as its factorization.

431235421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 431235421 is about 20766.2086332580. The cubic root of 431235421 is about 755.5063901022.

Adding to 431235421 its reverse (124532134), we get a palindrome (555767555).

The spelling of 431235421 in words is "four hundred thirty-one million, two hundred thirty-five thousand, four hundred twenty-one".