431379521 has 2 divisors, whose sum is σ = 431379522. Its totient is φ = 431379520.

The previous prime is 431379517. The next prime is 431379523. The reversal of 431379521 is 125973134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425184400 + 6195121 = 20620^2 + 2489^2 .

It is a cyclic number.

It is not a de Polignac number, because 431379521 - 2² = 431379517 is a prime.

It is a super-2 number, since 2×431379521² = 372176582276378882, which contains 22 as substring.

Together with 431379523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (431379523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215689760 + 215689761.

It is an arithmetic number, because the mean of its divisors is an integer number (215689761).

Almost surely, 2^431379521 is an apocalyptic number.

It is an amenable number.

431379521 is a deficient number, since it is larger than the sum of its proper divisors (1).

431379521 is an equidigital number, since it uses as much as digits as its factorization.

431379521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 431379521 is about 20769.6779223945. The cubic root of 431379521 is about 755.5905331182.

The spelling of 431379521 in words is "four hundred thirty-one million, three hundred seventy-nine thousand, five hundred twenty-one".