431021020235891 has 2 divisors, whose sum is σ = 431021020235892. Its totient is φ = 431021020235890.

The previous prime is 431021020235879. The next prime is 431021020235917. The reversal of 431021020235891 is 198532020120134.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 431021020235891 - 2¹⁰ = 431021020234867 is a prime.

It is not a weakly prime, because it can be changed into another prime (431021020235801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215510510117945 + 215510510117946.

It is an arithmetic number, because the mean of its divisors is an integer number (215510510117946).

Almost surely, 2^{431021020235891} is an apocalyptic number.

431021020235891 is a deficient number, since it is larger than the sum of its proper divisors (1).

431021020235891 is an equidigital number, since it uses as much as digits as its factorization.

431021020235891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 431021020235891 in words is "four hundred thirty-one trillion, twenty-one billion, twenty million, two hundred thirty-five thousand, eight hundred ninety-one".