431536421 has 2 divisors, whose sum is σ = 431536422. Its totient is φ = 431536420.

The previous prime is 431536363. The next prime is 431536459. The reversal of 431536421 is 124635134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305760196 + 125776225 = 17486^2 + 11215^2 .

It is a cyclic number.

It is not a de Polignac number, because 431536421 - 2²² = 427342117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431536471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215768210 + 215768211.

It is an arithmetic number, because the mean of its divisors is an integer number (215768211).

Almost surely, 2^431536421 is an apocalyptic number.

It is an amenable number.

431536421 is a deficient number, since it is larger than the sum of its proper divisors (1).

431536421 is an equidigital number, since it uses as much as digits as its factorization.

431536421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 431536421 is about 20773.4547199064. The cubic root of 431536421 is about 755.6821290166.

The spelling of 431536421 in words is "four hundred thirty-one million, five hundred thirty-six thousand, four hundred twenty-one".