431041981 has 2 divisors, whose sum is σ = 431041982. Its totient is φ = 431041980.

The previous prime is 431041973. The next prime is 431042047. The reversal of 431041981 is 189140134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 410872900 + 20169081 = 20270^2 + 4491^2 .

It is a cyclic number.

It is not a de Polignac number, because 431041981 - 2³ = 431041973 is a prime.

It is a super-2 number, since 2×431041981² = 371594378768808722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431041931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215520990 + 215520991.

It is an arithmetic number, because the mean of its divisors is an integer number (215520991).

Almost surely, 2^431041981 is an apocalyptic number.

It is an amenable number.

431041981 is a deficient number, since it is larger than the sum of its proper divisors (1).

431041981 is an equidigital number, since it uses as much as digits as its factorization.

431041981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 431041981 is about 20761.5505442151. The cubic root of 431041981 is about 755.3934069484.

The spelling of 431041981 in words is "four hundred thirty-one million, forty-one thousand, nine hundred eighty-one".