431420623199981 has 2 divisors, whose sum is σ = 431420623199982. Its totient is φ = 431420623199980.

The previous prime is 431420623199953. The next prime is 431420623200001. The reversal of 431420623199981 is 189991326024134.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234882934943881 + 196537688256100 = 15325891^2 + 14019190^2 .

It is a cyclic number.

It is not a de Polignac number, because 431420623199981 - 2¹⁴ = 431420623183597 is a prime.

It is a super-2 number, since 2×431420623199981² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431420623199941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215710311599990 + 215710311599991.

It is an arithmetic number, because the mean of its divisors is an integer number (215710311599991).

Almost surely, 2^{431420623199981} is an apocalyptic number.

It is an amenable number.

431420623199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

431420623199981 is an equidigital number, since it uses as much as digits as its factorization.

431420623199981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20155392, while the sum is 62.

The spelling of 431420623199981 in words is "four hundred thirty-one trillion, four hundred twenty billion, six hundred twenty-three million, one hundred ninety-nine thousand, nine hundred eighty-one".