431066521 has 2 divisors, whose sum is σ = 431066522. Its totient is φ = 431066520.

The previous prime is 431066453. The next prime is 431066561. The reversal of 431066521 is 125660134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 430106121 + 960400 = 20739^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 431066521 - 2²¹ = 428969369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 431066521.

It is not a weakly prime, because it can be changed into another prime (431066561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215533260 + 215533261.

It is an arithmetic number, because the mean of its divisors is an integer number (215533261).

Almost surely, 2^431066521 is an apocalyptic number.

It is an amenable number.

431066521 is a deficient number, since it is larger than the sum of its proper divisors (1).

431066521 is an equidigital number, since it uses as much as digits as its factorization.

431066521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 431066521 is about 20762.1415321252. The cubic root of 431066521 is about 755.4077419809.

The spelling of 431066521 in words is "four hundred thirty-one million, sixty-six thousand, five hundred twenty-one".